Question

An object is placed 0.1m in front of a convex lens of focal length 20 cm made of a material of refractive index 1.5. The surface of the lens away from the object is silvered. If the radius of curvature of the silvered surface is 22 cm, then the distance of the final image from the silvered surface is

Answer 1

Answer:

The image will be formed 11 cm in front of concave mirror and its real.

Explanation:

Given that,

Focal length f = 20 cm

Object distance u = -10 cm

Refractive index n = 1.5

Radius of curvature of silvered lens R = 22 cm

The surface of the lens is silvered then lens will behave as a concave mirror.

So, the focal length of concave mirror

Therefore, the power of the mirror

Further, focal length of the lens is 20 cm.

So, the power of lens is