Find the power of a convex lens of focal length 25 cm.

Find the power of a concave lens of focal length 2 m ?

An object is placed in front of a convex lens of focal length 30 cm. An image of magnification +2 is formed on the same side of the convex lens. Find the nature and position of the image. Also, draw a ray diagram.

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.

An object is placed at a distance of 10 cm from a convex lens of focal length 15 cm. Find the position, nature and magnification of the image. Also, draw a ray diagram.

Calculate the focal length of the combination of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm. Is the system a converging or diverging lens?

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.

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.

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