CBSE X Physics Light - Reflection and Refraction
what is focal length of a plane mirror/
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22nd February 2008
12:32 AM
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CBSE X Physics Light - Reflection and Refraction
How to know that the given focal length/dictance is positive or negative
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24th February 2008
11:30 AM
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CBSE IX Physics
How to find out the radius of curvature of a covex lens when focal length is given?
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12th March 2008
9:13 PM
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CBSE X Physics Light - Reflection and Refraction
what will happen to the focal length of a concave mirror, convex mirror, concave lens and convex lens when immersed in water? will it change ? if yes explain .(3 marks)
Asked by Rida Mukadam
21st February 2015
7:43 PM
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CBSE XII Science Physics Ray Optics and Optical Instruments
establish the relation 1/u+1/v=1/f for a concave mirror forming virtual image
Asked by uttam kumar
23rd February 2015
9:31 AM
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CBSE X Physics Light - Reflection and Refraction
1. detemine the focal length of a spherical mirror which forms a 3 times magnified real image of an object placed 16 cm in front of it.
Will m=3 or m= -3 why
2.the image of an object placed 36 cm from a shpericl lens is formed on a screen at a distace of 72 cm from lens Find its f?
Will v=72 or v= -72 why
Asked by P S Lakshmi
4th March 2015
12:49 PM
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CBSE XII Science Physics Ray Optics and Optical Instruments
Q.On a convex lens ,light of red and violet colour is incident separately , then how does the focal length of lens change?
Asked by Ravi consul
4th March 2015
6:48 PM
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NEET1 NEET1 Physics Geometrical Optics
an object is placed at a distance of f/2 from a concavex lens. The image will be? A-at 3f/2,real and Inverted.B-at 2f virtual and erect. C-at f real and inverted. D-at one of the foci virtual and double size.
Asked by Priyanka
13th November 2017
9:35 PM
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CBSE XII Science Physics
a convex lens of focal length f is cut into two halves such that one surface of each is plane what is the focal length of each half
Asked by deepakphy93
3rd January 2018
1:08 PM
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CBSE XII Science Physics
A convex lens is placed in contact with a plane mirror. a point object is placed 20cm on the axis of the combination has its image coincideing with itself.what is the focal length of the lens?
Asked by vasturushi
1st February 2018
9:50 PM
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CBSE X Science
Prove mathematically that r=2f for mirror.
Asked by shyamala.holla3
16th February 2018
3:35 PM
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CBSE XII Science Physics
Dera sir, please explain the displacement method to find the focal length of the convex lens in detail
Asked by modi72879
22nd February 2018
10:03 PM
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CBSE X Physics
A Compound lens is made up of two thin lenses having + 12.5 D -2.5 D find the focal length and the power of combination
Asked by Ak9639315541
14th March 2018
10:00 PM
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JEE Plances JEE (Main) Physics
plz solve the question with explanation
Asked by futureisbright051101
11th April 2018
6:41 AM
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JEE Plances JEE (Main) Physics
plz solve the question with explanation
Asked by futureisbright051101
11th April 2018
6:49 AM
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ICSE X Physics Refraction Through a Lens
Q. 2
Asked by Rayeesa
25th April 2018
9:54 PM
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CBSE X Physics
a convexmirror is held in water how focal length will be changed
Asked by yanamika14b
30th June 2018
7:57 PM
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CBSE X Physics
A real image produced by a concave mirror is found to be 4 times the size of the object. If the distance of the mirror is 20 cm from the object, find the focal length.
Asked by lakhinandanbora21590
11th July 2018
5:44 PM
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CBSE X Physics
why R=2
??? state the reason.
??? state the reason.
Asked by edayoor
11th August 2018
9:45 PM
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NEET1 NEET1 Physics
Please answer the following question with explanation
Asked by kkudgiri55
19th October 2018
5:28 PM
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NEET1 NEET1 Physics
Please answer the following question with explanation
Asked by kkudgiri55
20th October 2018
3:37 PM
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Gujarat X Physics
relation between focal length and radius of curvatyre
Asked by hetvpatel444
3rd December 2018
9:49 AM
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CBSE XII Science Physics Ray Optics and Optical Instruments
please solve the question in the picture.
Asked by rohitraman1115
12th January 2019
12:19 PM
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CBSE XII Science Physics
kindly answer pl
Asked by jain.pradeep
19th February 2019
10:30 AM
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ICSE X Physics
If the lens is placed in water instead of air its focal length increases why?
Asked by aditisinha952003
2nd March 2019
7:23 PM
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ICSE X Physics Refraction Through a Lens
Q. An object is placed at a distance of 24 cm in front of a convex lens of focal length 8 cm. (i) What is the nature of the image formed? (ii) Calculate the distance of the image from the lens. (iii) Calculate the magnification of the image.
Asked by akshushashu123
6th March 2019
10:00 AM
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CBSE X Physics
When a person sees a distant object the focal length of eye lens is 40 cm. What will be the focal length of eye lens when he focuses on a near object?
Asked by saradamahapatra9999
18th March 2019
2:07 PM
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ICSE IX Physics Reflection of Light
An object is front of convex mirror at distance of 0.24m with focal length of 0.15m find the value of image formed
Asked by dhruvikapinni
5th April 2019
1:55 PM
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CBSE X Physics Light - Reflection and Refraction
A lens of focal length 20 cm forms the image of a bright object kept 30 cm from it on a screen. If the lens is replaced by another lens, the object has to be moved by 5 cm to obtain a sharp image on the screen. Find the possible values of the focal length of the second lens.
Asked by k.suman39
19th April 2019
9:08 AM
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JEE Main Physics Optics
solve
Asked by sarveshvibrantacademy
29th April 2019
10:52 AM
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CBSE X Physics
how to find focal length of a lens in another medium
Asked by krishnasajeevan4601
3rd May 2019
6:43 AM
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CBSE XI Science Physics
A real image 2 times the size of an object is formed by a concave mirror. When the mirror and the object are shifted, the image formed becomes 4 times the size of the object. Find the focal length of the mirror if the image were to be shifted 24cm
Asked by bukokaakinsola39
31st May 2019
8:56 AM
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CBSE X Physics Light - Reflection and Refraction
Does focal length of concave lens change when immersed in water?
Asked by anamikasingla116
5th July 2019
11:24 AM
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NEET NEET Physics
Please answer this
Asked by Prashant DIGHE
30th July 2019
7:56 AM
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NEET NEET Physics
Please answer this
Asked by Prashant DIGHE
30th July 2019
8:15 AM
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ICSE X Physics Refraction Through a Lens
How is the focal length of a lens affected by change in(1) radii of curvature of two surfaces of lens (2)refractive index of the material of lens?
Asked by Kanwaranita10
7th August 2019
5:41 PM
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CBSE X Physics
what will be F (focal length)
Asked by aditya.rane
10th August 2019
4:09 PM
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CBSE X Physics
What is the difference between principal focus and focal length?
Asked by shreyashahi3014
11th August 2019
10:02 PM
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CBSE X Physics Light - Reflection and Refraction
What is Radius of Curvature, Optic centre, focal length?
Asked by vaibhavsingh73329
10th September 2019
2:15 PM
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CBSE X Physics The Human Eye and The Colourful World
Is the distance between lens and retina of the eye always remains the same?
Asked by Vishalgarg12345678
10th October 2019
5:15 PM
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CBSE X Physics Light - Reflection and Refraction
A concave mirror has a magnification of -2.5 if its focal length is 20 cm find its image and object position?
Asked by ajajaysanja
23rd October 2019
11:00 AM
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CBSE X Physics Light - Reflection and Refraction
Difference between focal length and radius of curvature?!
Asked by drhimasingh
30th November 2019
12:22 PM
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CBSE X Physics Light - Reflection and Refraction
Define 1 dioptre of power of lens
Asked by lalaarmaan4141
16th December 2019
12:41 PM
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CBSE X Physics
Define the focal length of lens
Asked by dilipvenkat259
10th January 2020
4:53 AM
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CBSE X Physics The Human Eye and The Colourful World
What is the focal length and power of eye lens of a healthy person
Asked by saradamahapatra9999
12th February 2020
10:24 AM
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CBSE X Physics Light - Reflection and Refraction
A screen bearing a real image of magnification m1,formed by a convex lens,is moved by a distance x.The object is then moved until a new image of magnification m2 is formed on screen.The focal lenght of lens is: (1) . x/m2-m1 (2) . m2-m1/x (3) . x/m1-m2 (4) . m1-m2/x
Asked by dfojajjar
16th February 2020
1:35 PM
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CBSE XII Science Physics
The focal length of convex lens 20 cm. It is kept in contact with a concave lens of focal length 25cm. Determine the focal length and power of the combined lens.
Asked by imranbharveli
7th March 2020
7:47 PM
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CBSE X Physics Light - Reflection and Refraction
radius of curvature of a concave mirror is twenty five centimeter what is its focal length
Asked by pandeyriddima6
11th September 2020
1:49 PM
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ICSE X Physics
How to find focal length of combination
Asked by rsharini.04
23rd November 2020
7:43 AM
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CBSE X Physics Light - Reflection and Refraction
Science
Asked by panwarn1234
2nd December 2020
2:43 PM
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CBSE X Physics Light - Reflection and Refraction
The relation between focal length and radius of curvature is given by
Asked by pothireddysonyreddy27
24th January 2021
5:41 PM
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NEET NEET Physics
the power of convex lens of refractive index 1.5 is 0.5D in air in water refractive index 4÷3 it's focal length will be
Asked by racchurashmi74
10th February 2021
6:05 AM
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ICSE X Physics Light - Reflection and Refraction
If focal length of a biconvex lens are 20cm and 40cmr respectivily& refractive index is 1.5, then find the combination focal length of givenl lens?
Asked by narendra172193
9th April 2021
3:27 PM
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CBSE X Physics Electricity
This is the question from class 10 light chapter asked in our state model paper
Asked by akashsrnm
8th May 2021
7:21 PM
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ICSE X Physics Refraction Through a Lens
two thin lenses of power +3.5 D and -2.5 D are placed in contact . What is the focal length of the lens combination
Asked by smithasumi1976
12th September 2021
12:23 PM
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ICSE IX Physics Reflection of Light
how to determine whether focal length is negative or positive
Asked by studyworkofficial
18th November 2021
6:41 PM
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CBSE XII Science Physics Ray Optics and Optical Instruments
if for a perfectly symmertical lens, r1=r2, then how will we find focal length??
Asked by Dark
5th January 2022
11:54 AM
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Maharashtra IX Physics
An object placed at 20 cm from concave mirror forms a real inverted image at a distance 40 cm from the concave mirror . Find the focal length of the concave mirror
Asked by savitadurge
1st March 2022
1:53 PM
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JEE Main Physics Optics
a concave lens is dipped in a liquid whose, refractive index is equal to refractive index of the lens then it's focal length of lens is
Asked by kumarpurshotam451
29th September 2023
3:46 PM
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