What would your image look like if you stood dose to a large:

1. Convex mirror?
2. Concave mirror?

Give reasons for your answer.

(i) Explain why the refractive index of any material with respect to air is always greater 1 .
(ii) In the figure below a light ray travels from air into the semi-circular plastic block. Give a reason why the ray does not deviate at the semi-circular boundary of the plastic block.

(iii) Complete the ray diagram of the above scenario when the light ray comes out of the plastic block from the top flat end.

The radius of curvature of a convex mirror used as a rear view mirror in a moving car is 2.0m. A truck is coming from behind it at a distance of 3.5m. Calculate (a) position, and (b) size, of the image relative to the size of the truck. What will be the nature of the image?

An object placed 45cm from a lens forms an image on a screen place 90cm on the other side of the lens. Identify the type of the lens and find its focal length.

An object is placed at a distance of 100cm from a converging lens of focal length 40cm.

1. What is the nature of image?
2. What is the position of image?

A convex lens produces an inverted image magnified three times of an object placed at a distance of 15cm from it. Calculate focal length of the lens.

An object is 24cm away from a concave mirror and its image is 16cm from the mirror. Find the focal length and radius of curvature of the mirror, and the magnification of the image.

Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

Draw the ray diagram and also state the position, relative size and nature of the image formed by a concave mirror when the object is placed between its centre of curvature, C and the focus, F.

A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50cm from the mirror.

1. Write the type of mirror.
2. find the distance of the image from the object.
3. What is the focal length of the mirror?
4. Draw the ray diagram to show the image formation in this case.

The shiny outer surface of a hollow sphere of aluminium of radius 50cm is to be used as a mirror:

1. What will be the focal length of this mirror?
2. Which type of spherical mirror will it provide?
3. State whether this spherical mirror will diverge or converge light rays.