A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 10 cm. What is the focal length and power of the combination ?

A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. What is the nature and focal length of the combination ?

A convex lens of focal length 10.0 cm is placed in contact with a convex lens of 15.0 cm focal length. What is the focal length of the combination ?

In an optical instrument, a convex lens of focal length 20 cm is used in combination with a concave lens of focal length 40 cm. What is the power of this combination?

A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:

A convax lens of focal length 10.0cm is placed in contact with a convex lens of 15.0cm focal length ,What is the focal length of the combination.

A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 cm. Determine the power of the combination. Will the system be converging or diverging in nature?

A convex lens of focal length 25 cm is placed co-axially in contact with a concave lens of focal length 20 cm . Determine the power of the combination. Will the system be converging or diverging in nature ?

A convex lens of focal length 25 cm is placed co-axially in contact with a concave lens of focal length 20 cm . Determine the power of the combination. Will the system be converging or diverging in nature ?

A convex lens of focal length 25 cm is placed co-axially in contact with a concave lens of focal length 20 cm . Determine the power of the combination. Will the system be converging or diverging in nature ?