The greatest thickness of a plano-convex glass lens appears to be 2 cm when observed normally through the plane face, and when observed through the curved face the greatest thickness appears to be 20/9 cms. If real thickness is 3 cm then the radius of curvature of the spherical surface is -
Text Solution
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When seen through plane face
d apparent = 
⇒ 2 = 
...(1)
when seen through curved face
apply, 
...(2)
where μ 2 = ref index of air
μ 1 = ref index of glass i.e. μ
v = 
cm ; u = – 3cm
Apply in 2 equation & then solve (1) & (2)
radius of curvature = 10 cm
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