An object is placed at a distance of 6cm from a convex mirror of focal length 12cm. Find the position and nature of the image.

How is the reflection of light ray from a plane mirror different from the refraction of light ray as it enters a block of glass?

Draw ray diagrams showing the image formation by a convex lens when an object is placed:
Between optical centre and focus of the lens.

An object is placed just outside the principal focus of concave mirror. Draw a ray diagram to show how the image is formed, and describe its size, position and nature.

What is the minimum number of rays required for locating the image formed by a concave mirror for an object. Draw a ray diagram to show the formation of a virtual image by a concave mirror.

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?

What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?

What is the position of the image when an object is placed at a distance of 20cm from a concave mirror of focal length 20cm?

Write down a formula for the magnification produced by a concave mirror.

1. In terms of height of object and height of image.
2. In terms of object distance and image distance.