A point object in air is situated 68 cm from the pole of a convex spherical refracting surface. The medium beyond the surface has refractive index 1.85 and the radius of curvature is +48 cm. Find the image distance from the pole and use its sign to identify the side on which the image is formed.
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Question

A point object in air is situated 68 cm from the pole of a convex spherical refracting surface. The medium beyond the surface has refractive index 1.85 and the radius of curvature is +48 cm. Find the image distance from the pole and use its sign to identify the side on which the image is formed.

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G1 Physics · Accepted Answer

Using μ₂/v − μ₁/u = (μ₂−μ₁)/R with μ₁=1, u=-68 cm, μ₂=1.85 and R=+48 cm: 1.85/v − 1/(-68) = (1.85−1)/48. Hence v=616.16 cm.