Question

The focal length of convex lens 20 cm. It is kept in contact with a concave lens of

Answer 1

Hello

Answer: The power of the concave lens is -3D.

Explanation:

Given that,

Focal length of convex lens f = 20 cm

Focal length of combination

Now, the power is

Now, power of the convex lens is

The power of the combination of the lenses

We know that,

The power of the concave lens is

Here, P' is the power of concave lens

Hence, The power of the concave lens is -3D.

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