Question

How will you distinguish between a convex and a concave lens on the basis of nature of image formed? justify your answer.​

Answer 1

A convex lens or converging lens focuses the light rays to a specific point whereas a concave lens or diverging lens diverges the light rays.

Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens.

Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens.

Answer 2

A concave lens always forms virtual, erect and diminished image as its nature is diverging..
and for all values of object distance in convex lens except when the object is between optical centre and focus it forms real and inverted image... The magnification varies as per the object distance(u). Nature of convex lens is converging