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There are two spherical surfaces of radi...

There are two spherical surfaces of radii `R_(1)=30cm` and `R_(2)=60cm`. In how many ways these surfaces may be arranged to get different lenses. If all the lenses are made of glass `(mu=1.5)` , find the focal length of each lens.

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The correct Answer is:
(a) four ways ; (b) 40cm, 120cm,-40cm ; -120cm
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