An object 2cm tall is placed on the axis of a convex lens of focal length 5cm at a distance of 10m from the optical centre of the lens. Find the nature, position and size of the image formed. Which case of image formation by convex lenses is illustrated by this example?

Draw a ray diagram showing the path of rays of light when it enters with oblique incidence:

1. From air into water;
2. From water into air.

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 of height 4cm is placed at a distance of 15cm in front of a concave lens of power, -10 dioptres. Find the size of the image.

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

An object is placed at a distance of 100cm from each of the above lenses A and Calculate:

1. Image distance, and
2. Magnification, in each of the two cases.

An image formed on a screen is three times the size of the object. The object and screen are 80cm apart when the image is sharply focussed.

1. State which type of lens is used.
2. Calculate focal length of the lens.

At what distance from a concave mirror of focal length 10cm should an object 2cm long be placed in order to get an erect image 6cm tall?

For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.