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Question

Light from a point source in air falls on a convex spherical glass surface of refractive index 1.5 and radius of curvature 80cm. The distance of light source from the glass surface is 100cm. At what position is the image formed?

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Solution

By this formula

n2/v - n1/u = (n2-n1)/R
1.5/v = (1.5-1)/20 + 1/-100
1.5/v = 5/200 - 1/100
1.5/v = 5-2/200
1.5/v = 3/200
v = 1.5x200/3 = 100

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