A man used a concave lens of focal length 20cm.Find the power of the lens.

A person having a myopic eye uses a concave lens of focal length 20 cm. What is the power of the lens?

a concave lens of focal length 20cm is placed in contact with a convex lens of focal length 40cm. Find the power of the combination.

An object is placed at a distance of 50 cm from a concave lens of focal length 20 cm. Find the nature and position of the image.

An object is placed 30cm away from a concave lens of focal length 15cm. Find the position, size and nature of the image.

What is concave lens ?

An object is placed at a distance of 36 cm from a convex lens of focal length 12 cm. Find the position, nature and magnification of the image. Also, draw a ray diagram.