A concave lens is kept in contact with a convex lens of focal length `20 cm`. The combination works as a converging lens of focal length `100 cm`. Calculate power of concave lens.

A concave lens is kept in contact with a convex lens of focal length `

1.	A concave lens is kept in contact with a convex lens of focal length `20 cm`. The combination works as a converging lens of focal length `100 cm`. Calculate power of concave lens.
Answer» Correct Answer - `-4D`

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A concave lens is kept in contact with a convex lens of focal length `20 cm`. The combination works as a converging lens of focal length `100 cm`. Calculate power of concave lens.

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