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CBSE - XII Science - Physics - Ray Optics and Optical Instruments
a thin stick of length f/5 is placed along principle axis of a concave mirror of focal length f such that it's image which is real and elongated just touches the stick .what is the magnification
Asked by amishavasave56.12dgatl
27th August 2021,
5:25 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Sign convention in concave mirror
Asked by raushankumarmushkipur
2nd April 2021,
10:08 AM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
When a person is moving with a constant speed the speed of his/her image appears to increase substantially as he/she moves closer to the mirror as noticed by a person sitting in a stationary car. Why?
Asked by prakriti12oct
11th February 2020,
2:48 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Use the mirror equation to deduce that The virtual image produced by a convex mirror is always diminished in size.
Asked by prakriti12oct
27th June 2019,
2:20 AM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Derive mirror formula for concex mirror.
Asked by polyrelation
15th March 2019,
4:42 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A convex mirror of radius of curvature 70 cm and a plane mirror are placed facing each other. The distance between them is 28 cm. A point object is put midway between them on the principle axis of the mirror. Two images of the object are seen in the plane mirror. Find their distances from the plane mirror.
Asked by mridulabarua05
11th February 2019,
1:10 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
1. The interior of a hollow metal sphere is polished to serve as a mirror. At a point 12cm from the centre of the sphere of radius 24 cm, a point source of light is placed. Locate its image formed by two successive reflections, the first reflection taking place at the (a) far wall (b) near wall. 2. And image produced by a concave mirror is one fourth the size of the object. If the object is moved 10 cm towards the mirror, its image will be only half the size of the object. Calculate the focal length of the mirror.
Asked by mridulabarua05
7th February 2019,
9:10 AM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A point luminous source P is placed on the principle axis of a concave mirror of radius of radius of curvature 1m at a distance of 75 cm from its pole. At what distance from the concave mirror should a plane mirror be set so that the rays from P, after reflection from the concave mirror and then from the plane mirror again converge at the point P? Does the point of convergence of the rays change if they are first reflected at the plane mirror and then at the concave mirror?
Asked by mridulabarua05
2nd February 2019,
11:23 AM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
derive mirror formula
Asked by Aadeshveersingh03
7th January 2019,
7:57 AM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
sign convention in ray optics
Asked by mkiruthiga90
14th December 2018,
7:32 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
An object 4cm in size, is placed at 25cm infront of a concave mirror of focal length 15cm. At what distance from the mirror whould a screen be placed in order to obtain a sharp image?Find the nature and the size of the image.
Asked by amarapurevathi
5th October 2018,
12:22 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Use the mirror formula to show that a)an object placed between f and 2f of a concave mirror produces a real image beyond 2f b)a convex mirror always produces a virtual image independent of the location of the object c)an object placed between the pole and focus of a concave mirror produces virtual and enlarged image
Asked by vasturushi
2nd February 2018,
6:58 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
how can the real image of an object be obtained with a convex mirror?
Asked by vinodjoshi112233
10th December 2017,
8:13 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A mirror is inclined at an angle of theta with the horizontal. If a ray of light is incident at an angle theta with the mirror ,then the angle made by reflected ray with the horizontal is
Asked by ajeet
14th October 2017,
11:05 AM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
the wall of the room is covered with a perfect plane mirror and two movie films are made one recording the movement of a man and the other of his mirror image while viewing the film later can an outsider tell which is which ?
Asked by vinodjoshi112233
20th September 2017,
4:02 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A point object O is placed between two plane mirror M1 and M2 10mm apart.The distance of object O from M2 is 2mm.Find the distance of the first three images formed by mirror M2.
Asked by Balbir
9th August 2017,
6:29 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
1.draw a ray diagram to show the formation of the real imageof a point object due to a convex spherecial refracting surface when a ray of light is travelling from a rarer medium of refractive index u 2 .hence derive the relation between object object distance image distance and radiusof curvature of the spherical surface .
Asked by mahamood.iphone
5th January 2016,
4:03 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
give an example of mirror whose magnification is -1
Asked by Navya Benny
21st July 2015,
10:38 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
An object is placed 15 cm in front of a convex lens of focal length 10 cm. Find the nature and position of the image formed. Where should a concave mirror of radius of curvature 20 cm be placed so that the final image is formed at the position of the object itself?
Asked by Topperlearning User
10th July 2015,
8:53 AM
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
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A point object O is kept at a distance of 30 cm from a convex lens of power +4D towards its left. It is observed that when a convex mirror is kept on the right side at a distance of 50 cm from the convex lens, the image of the object O formed by the lens-mirror combination coincides with the object itself.
Calculate the focal length of the convex mirror
A point object O is kept at a distance of 30 cm from a convex lens of power +4D towards its left. It is observed that when a convex mirror is kept on the right side at a distance of 50 cm from the convex lens, the image of the object O formed by the lens-mirror combination coincides with the object itself.
Calculate the focal length of the convex mirror
Asked by Indra
1st February 2015,
7:53 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
What are virtual and real images exactly?
and would you derive me mirror equation?
Asked by divyashrisureshbabu
11th October 2014,
1:59 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
derivation of mirror equation?? and its uses?
Asked by Tanmai Reddy
11th August 2014,
10:02 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A convex lens of refractive index 1.5 has a focal length of cm in air.
Calculate the change in its focal length when it is immersed in water of refractive index 
Asked by Topperlearning User
7th July 2014,
6:21 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Show the variation of u 
in case of a convex mirror?
in case of a convex mirror?
Asked by Topperlearning User
7th July 2014,
5:58 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
two plane mirrors inclined at 65 degree.a ray of light incident on one mirror at angle alpha,is rendered parallel to the first mirror after two reflections.then alpha is?
Asked by gokul
22nd June 2014,
1:58 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Deviation of ray of light after undergoing succesive reflection from two PLANE mirrors inclined at certain angle is 288 degree,number of images formed is
Asked by gokul
22nd June 2014,
1:53 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Use mirror formula to show that for an object lying between the pole and focus of a concave mirror, the image formed is always virtual in nature.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Prove that for a mirror, the radius of curvature is twice the focal length.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
Illustrate the wavefront associated with reflection of light from a concave mirror.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
What is the difference between virtual images produced by a concave mirror and a convex mirror?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
How is the reflection of light from a mirror different from total internal reflection of light?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
A square loop of wire of side 4 cm is placed 20 cm away from a concave mirror of focal length 8 cm. What is the area enclosed by the image of the wire (assume that the centre of the loop is on the axis of the mirror and the two sides are normal to the axis)?
Asked by Topperlearning User
20th May 2014,
1:08 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
An object is kept in front of a concave mirror of focal length 12 cm. Calculate two possible distances of the object from the mirror, for which a magnification of 3 is obtained.
Asked by Topperlearning User
20th May 2014,
1:02 PM
CBSE - XII Science - Physics - Ray Optics and Optical Instruments
The image formed of an object, placed 20 cm from a concave mirror, is four times the size of the image formed of the same object when placed 45 cm from the mirror. In both cases, the image formed was real. What is the focal length of the mirror?
Asked by Topperlearning User
20th May 2014,
12:53 PM
