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Two thin lenses, one of focal length + 6...

Two thin lenses, one of focal length + 60 cm and the other of focal length – 20 cm are put in contact. The combined focal length is

A

+15 cm

B

- 15 cm

C

+ 30 cm

D

- 30 cm

Text Solution

Verified by Experts

The correct Answer is:
D
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