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A plano convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28 cm. When its curved surface is silvered and plane not silvered, its equivalent to concave mirror of focal length 10 cm then the refractive index of material of lens is 29×n. Calculate n

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Detailed Solution

1fnet=−2f2−1fmCase (1)fnet =−281−28=−2fL−1∞⇒1fL=1561fnet =−2fL−1fm1−10=−2fL−1−R2⇒1R=92801fL=(μ−1)1R⇒μ=149

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