An object is placed at a distance of 4 cm from a concave lens of focal length 8 cm. Find the position and nature of the image.

The lens A produces a magnification of, - 0.6 whereas lens B produces a magnification of + 0.6.

(a) What is the nature of lens A?

(b) What is the nature of lens B?

A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 30 cm in front of the lens. How much is the focal length of the lens?

A concave lens of focal length 15 cm forms an image 10cm from the lens. How far is the object placed from the lens? Draw the ray-diagram.

An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. What is the focal length of the lens? Is the lens converging or diverging? Give reasons for your answer.