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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Q no 9 
 

Asked by Varsneya Srinivas 24th December 2017, 11:43 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

What is a cassegrain telescope?

Asked by pksunilnair 4th December 2017, 9:46 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Please help me to solve this?

Asked by rajuharan 26th January 2017, 7:04 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

EXPLAIN DOPPLER EFFECT OF LIGHT.<I'VE STUDIED ABOUT RED SHIFT ,I HAVE NOT UNDERSTOOD IT>PLEASE EXPLAIN SO THAT I HAVE NO CONFUSION LEFT.
 

Asked by preethambasilmartis 22nd June 2016, 11:26 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

An angular magnification of30X is desired using objectve of focal length1.25 cm and an eye peice of focal length 5 cm. How would you set up compound icroscope
 

Asked by yashjha23 8th January 2016, 1:12 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

how power and length of aperture of lens is recquired in compound microscope and telescope

Asked by singhdivyanshu633 24th December 2015, 9:00 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

draw a ray diagram to show the image formation a compund microscope .explain briefly the working .derive an expression for its magnifying power.why the diameter of objective of microscope should be small?

Asked by mahamood.iphone 22nd December 2015, 12:13 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

define resolving power of compound microscope .how does the resolving power of a compound change when-a refractive index of medium between the object and objective lens increases b wavelength of the light used is increased c decreasing the diameter of objective d increasing the focal length of its objective

Asked by mahamood.iphone 21st December 2015, 10:34 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

define the resolving power of astronomical telescope.write the expression for it and state on what factors it depends

Asked by mahamood.iphone 21st December 2015, 10:27 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

can you please suggest me mnimum magnification required to build a astronomical telescope? how do size of aperture play role in the factors like resolution and magnification? could you pease also suggest me recommended lenses' focal length and aperture to build a telescope?

Asked by Somnath Pal 15th November 2015, 11:19 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

As shown above, a plane mirror is inclined at 30 degrees to horizontal and a horizontal ray is incident on it. What angle does the reflected ray make with the incident ray?

Asked by Aditya Great 3rd June 2015, 9:44 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

The focal lengths of the objective and the eyepiece of a compound microscope are 4cm and 6 cm respectively. If object is placed at distance 6 cm infront of objective lens, then maximum magnification of microscope is 
1.) 31/3
2.) 62/3
3.)15/3
4.)10/3
Please explain.

Asked by Kb Aulakh 25th April 2015, 5:46 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

suppose while sitting in a parked car you notice a jogger approaching towards you in a side view mirror of R=2m. if the jogger is running at a speed of 5m/s . how fast the iimage of the jogger appear to moove when the jogger is (a)39m (B)29m (C)19m (D)9m away. 

Asked by Kb Aulakh 6th March 2015, 7:51 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

derivation of youngs double slit expt?????

Asked by ARUN S 4th March 2015, 4:29 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

when is the magnification taken negative for telescope and compound microscope???
 

Asked by prativapradhan63 23rd February 2015, 10:18 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

the focal lengths of objective and eye lense of a microscope are 1.6 and 2.5 cm .the distance between the two lenses is 21.7cm.if the final image is formed at infinity the distance between the object and the objective lens is ?(ans.1.75cm)

Asked by Nidhi 26th December 2014, 1:42 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

<ul> <li>the diameter of moon is 3.5<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=c0c48ee878456ca4bd03e7b260cecd15.png" alt="cross times" align="middle" />10 3<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=1a5aa354805081691844f2c1bd3fe7d9.png" alt="blank to the power of blank" align="middle" />(10 to the power 3) &nbsp;km and its distance from the earth is 3.8<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=c0c48ee878456ca4bd03e7b260cecd15.png" alt="cross times" align="middle" />10 5(10 to the power 5)km. it is seen by atelescope having the focal length of the objective and the eye piece as 4m and 10 cm respectively. the diameter of the image of the moon will be approximately ?(ans.20<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=b11d7e43055ab38e82de105768df5315.png" alt="ring operator" align="middle" />).<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=1a5aa354805081691844f2c1bd3fe7d9.png" alt="blank to the power of blank" align="middle" /><img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=1a5aa354805081691844f2c1bd3fe7d9.png" alt="blank to the power of blank" align="middle" /></li> </ul>

Asked by Nidhi 25th December 2014, 12:27 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

an achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. this proper choice is ?

Asked by Nidhi 24th December 2014, 1:47 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

to remove the chromatic aberration the combination of lenses should be such that-                         A)Fr+Fv =0  (b) Fr>Fv (c) Fr<Fv (d.) Fr-Fv=0. [where Fr or Fv represents the equivalent focal lengths of the combination for red and violet colours.]  please explain it clearly.?     

Asked by Nidhi 24th December 2014, 1:41 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

<div>1)to remove the chromatic aberration the combination of lenses should be. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;whare( Fr and Fv represent the equivalent focal length of the combination for red and violet colours). &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2)an achromatic telescope objective is to be made by combining the lenses of flint and crown glasses.this proper choice is (ans.convergent of crown and divergent of flint) how? pls explain it. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3)an equilateral prism is placed on the prism table of spectrometer in the position of minimum deviation .if the angle of incidence is 60<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=b11d7e43055ab38e82de105768df5315.png" alt="ring operator" align="middle" />,the angle of deviation of the ray is (ans.60<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=b11d7e43055ab38e82de105768df5315.png" alt="ring operator" align="middle" />) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</div>

Asked by Nidhi 22nd December 2014, 2:35 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

  1. three lenses L1,L2,L3 are givien each of focal length 10cm.an object is kept at 15cm in front of L1 .the final real image is formed at focus of L3.find the seperation between L1,L2,L3

Asked by sagarmanisha97 12th December 2014, 9:04 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

where can i find all the derivation, working of optical instruments related to this chapters????

Asked by Karishma 2nd October 2014, 1:44 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

What is the reason for considering the focussing of light inside a telescope tube as a problem with the reflecting telescope?.

Asked by MAANASI.M 28th September 2014, 9:52 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

(a) Draw a ray diagram showing the image formation by a compound microscope. Hence obtain expression for total magnification when the image is formed at infinity. (b) Distinguish between myopia and hypermetropia. Show diagrammatically how these defects can be corrected.

Asked by Topperlearning User 12th June 2014, 7:53 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

The diameter of the lens of a telescope is 0.61 m.Wavelength of light is 5000 Å. What is the resolution power of the telescope?  

Asked by Topperlearning User 11th June 2014, 1:50 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

The focal length of the objective and eye piece of a telescope are 200 cm and 5 cm respectively.What is the maximum magnifying power of the telescope.

Asked by Topperlearning User 11th June 2014, 1:33 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

An astronomical telescope consists of two thin lenses 50 cm apart. It has magnification of 9 at normal adjustment. Obtain the focal length of the two lenses.

Asked by Topperlearning User 11th June 2014, 12:25 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Draw a ray diagram of an astronomical telescope in the normal adjustment position. Write down the expression for its magnifying power. State two drawbacks of this type of telescope.

Asked by Topperlearning User 11th June 2014, 11:01 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Draw a labelled ray diagram showing the course of rays in an astronomical telescope,when the final image is formed at least distance of distinct vision. Write mathematical expression for its magnifying power.By increasing the diameter of the objective of telescope, we can increase its range,why?

Asked by Topperlearning User 11th June 2014, 10:50 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

A compound microscope with an objective of 2 cm focal length and an eye-piece of 4 cm focal length has a tube length of 40 cm. Calculate the magnifying power of the microscope, if the final image is formed at infinity.

Asked by Topperlearning User 11th June 2014, 10:47 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Draw a labelled ray diagram of a reflecting type telescope. Write its any one advantage over refracting type telescope.

Asked by Topperlearning User 11th June 2014, 10:35 AM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Two convex lenses of same focal length but of aperture A1 and A2

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Define the term 'resolving power' of an astronomical telescope. How does it get affected on (i) increasing the aperture of the objective lens? (ii) Increasing the wavelength of the light used? Justify your answer in each case.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Using the data given below, state as to which of the given lenses will you prefer to use as i) an eyepiece, ii) an objective to construct an astronomical telescope. Give reason for your answer. Lens Power Aperture L1 1 D 0.10m L2 10 D 0.05m L3 10 D 0.02m L4 20D 0.02m

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

A compound microscope has an objective lens of focal length 5 mm and eyepiece of focal length 4 cm. The separation between the two lenses is 24.5 cm.Where should an object be placed such that the final image is formed at infinity?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. If the eye piece has a focal length of 5 cm and the final image is formed at the near point, estimate the magnifying power of the microscope.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

Draw the labelled ray diagram for the formation of image by a compound microscope.Derive the expression for the total magnification of a compound microscope. Explain why both the objective and the eyepiece of a compound microscope must have short focal lengths.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Ray Optics and Optical Instruments

An astronomical telescope, in normal adjustment position, has magnifying power 5. The distance between the objective and the eye-piece is 120 cm. Calculate the focal lengths of the objective and of the eye-piece.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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