Question

Q61 The ratio of powers of
two lenses is 3/4 when they
are in contact with each other.
Determine the focal lengths
of the individual lenses,
where one of the lens is​

Answer 1

Explanation:

Let the power of thin concave lens be -2P and power of thin convex lens be 3P.

Hence −2P+3P=301

⟹P=301cm−1

Thus focal length of concave lens is 2P1=15cm

Focal length of convex lens is 3P1=10cm

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