A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.

Does the incident and emergent ray coincide in the process of refraction through glass slab? Give reason.

“The magnification produced by a spherical mirror is - 3”. List four informations you obtain from this statement about the mirror/ image.

An object is placed at a distance of 12cm in front of a concave mirror of radius of curvature 30cm. List four characteristics of the image formed by the mirror.

Why can you not use a concave mirror as a rear-view mirror in vehicles?

A large concave mirror has a radius of curvature of 1.5m. A person stands 10m in front of the mirror. Where is the person’s image?

Refractive indices of four media A, B, C and D are given below:

Medium	Refractive index
A B C D	1.33 1.44 1.52 1.65

In which of these four media is the speed of light:

1. Maximum, and
2. Minimum?

Draw ray diagrams showing the image formation by a convex mirror when an object is placed:
At finite distance from the mirror.

If an object is placed at a distance of 8cm from a concave mirror of focal length 10cm, discuss the nature of the image formed by drawing the ray diagram.