Question

2. The focal length of a convex lens is 20
cm. What is its power?
Given: Focal length = f = 20 cm = 0.2 m
Power of the lens = P = ?​

Answer 1

Answer:

20/0.2 = 100 so than. ans is 2.5

Explanation:

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Answer 2

Answer:

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Given,

focal length of the convex lens = f = 20 cm = 0.2 m.

Therefore,

its power is: P = 1/f(in meters) = 1/0.2 = 5D.

• As, the power of diverging lens is ‒6.5 D

therefore,

the power of the combination is = 5D + (-6.5 D)

= -1.5 D.