A convex lens forms an inverted image of size same as that of the object which is placed at a distance 60 cm in front of the lens.

Find —

(a) The position of image, and

(b) The focal length of the lens

The power of a lens is +2.0 D. Find its focal length and state what kind of lens it is?

An object is placed at a distance of 20 cm in front of a concave lens of focal length 20 cm. Find —

(a) the position of the image, and

(b) the magnification of the image

Express the power (with sign) of a concave lens of focal length 20 cm.