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# CBSE Class 10 Answered

Hi sir/mam How can I solve this problem ?
Asked by sreekumar1974 | 24 Dec, 2019, 12:01: AM
We have equation of refraction in spherical surface as

( n2 / v ) - ( n1 / u ) = ( n2 - n1) /R  ......................(1)

where n1 is refractive index of medium of incident light ray .

In this question, n1 is refractive index of air , n1 =1

n2 is refractive index of refracting medium , in this case we assume n2 = 1.5 , is refractive index of glass

R is the Radius of curvature of spherical surface, v is image distance and u is object distance

hence using eqn.(1),  we have,  ( 1.5 / v ) +(1/10) = ( 0.5 / 10)  .................(2)

In eqn.(2), Cartesian sign convention is used so that object distanve u is negative.

From eqn.(2), we get, image distance v  = - 30 cm

Answered by Thiyagarajan K | 24 Dec, 2019, 09:37: AM

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