Question

A concave lens produce an Image 20 cm from the
lens of an object placed 30cm from the lens
find the focal length of the lens​

Answer 1

Answer:

-60cm

Explanation:

Given, u = -30cm & v = - 20.

According to the lens formula, 1/f = 1/v - 1/u

Therefore, 1/f = -1/20 + 1/30 = -3/60 + 2/60 = -1/60

Thus, f = -60 cm.

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Answer 2

Answer:

hope it helps you answer may right