A plano-convex lens is made of refractive index of 1.6. The focal length of the lens is
A plano-convex lens is made of refractive index of 1.6. The focal length of the lens is
A. 400 cm
B. 200 cm
C. 100 cm
D. 50 cm
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Correct Answer - C
(c ) Here, `1/f=(mu-1)[1/R_(1)-1/R_(2)]`
`1/f=(1.6-1)[1/60-1/oo]=1/100`
`rArr` f=100 cm
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