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

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Question:
 
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

1.10 cm

2.20 cm

3.30 cm

4.40 cm

Posted Date:-2021-03-26 07:51:12

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