Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

1.

Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

[A].	10 cm
[B].	20 cm
[C].	30 cm
[D].	40 cm

Answer: Option C

Explanation:

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