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A convex lens of focal length 20cm and a...

A convex lens of focal length 20cm and a concave lens of focal length f are mounted coaxially 5cm apart. Parallel beam of light incident on the convex lens emerges from the concave lens as a parallel beam. Then, f in cm is

A

30 cm

B

25 cm

C

15 cm

D

50 cm

Text Solution

Verified by Experts

The correct Answer is:
C
`d=f_(1)-f_(2)`
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