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?

What kind of lens can form?

(a) An inverted magnified image?

(b) An erect magnified image?

(c) An inverted diminished image?

(d) An erect diminished 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?

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.

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.