Question

A convex lenses of focal length 15cm is kept in contact with a concave lens of focal
length 12cm. What is the focal length of the combination? Is the combination
converging or diverging?

Answer 1

Answer:

Focal length of convex lenses, f1  =30cm

Focal length of concave lenses, f2 = −20cm

$⇒ f1​ = f 1​ 1​ + f 2​ 1​$

f=−60cm. Therefore diverging lens .

Explanation:

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