Home
Class 12
PHYSICS
An object is placed 21 cm in fron of a c...

An object is placed 21 cm in fron of a concave mirror of radis of curvature 20 cm.A glass slab of thicknes 3 cm and refractive index 1.5 is palced close to the mirror in the space between the object and the mirror. Find the position of the final image fromed. The distance of the nearer surface of the slab from the mirror is 10 cm.

Text Solution

Verified by Experts

The situation is shown in ure. Because of the refraction at the two surfaces of the slab, theimage of the objet P is formed at `P_1` shifted towards the mirror by a distance
`t(1-1/mu)=(3cm) (1-1/1.5)=1cm`
Thus the rays faling on the concave mirror are diverging from `P_1` which is at 21 cm -1=20 cm from the mirror. But the radius of curvature is also 20 cm, hence `P_1` is at teh centre. The rays therefore fall normally on the mirror and hence, retrace their path. The final image is formed at P itself.
Promotional Banner

Similar Questions

Explore conceptually related problems

A point object is placed 33cm from a convex mirror of curvature radius =40cm A glass plate of thickness 6cm and refractive index 2.0 placed between the object and mirror,close to the mirror,find the distance of final image form the object?

An object is placed at 30 cm in front of a concave mirror of radius of curvature 30 cm. Find the position, nature, and magnification of the image in each case.

A slab of glass, of thickness 6 cm and refractive index mu =1.5 is placed in front of a concave mirror. If the radius of curvature of the mirror is 40 cm and the reflected image coincides with the object, then the distance of the object from the mirror is

An object is placed at (i) 10 cm, (ii) 5 cm in front of a concave mirror of radius of curvature 15 cm. Find the position, nature, and magnification of the image in each case.

A point object is placed at a diatance of 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object, the image is formed at infinity. The thickness t is

A small ink dot on a paper is viewed through a glass slab of thickness 10cm and refractive index 1.5. By what distance would the dot appear to be raised?

An object is placed at a distance 40 cm in front of concave mirror. Focal length of mirror is 20 cm, so what will be type of image ?

Object is placed 60 cm away from convex mirror. If magnification is 0.5, image distance = …....

A point object is placed at the centre of a glass sphere of radius 6cm and refractive index 1.5. The distance of virtual image from the surface is

A pin is placed 10cm in front of a convex lens of focal length 20cm, made of a material having refractive index 1.5 . The surface of lens farther away from the pin is silvered and has a radius of curvature 22cm. Determine the position of the final image. Is the image real or virtual?