The radius of curvature of curved surface of a thin plano - convex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be
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a
15 cm
b
20 cm
c
5 cm
d
10 cm
answer is D.
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Detailed Solution
R=10cm Plano convex lens μ=1.51fl=μ−11R1fl=0.5110=120When silvered at flat surface 1f=2fl+1∞1f=2fl=220=110 f=10cm