A point object in air is situated 60 cm from the pole of a convex spherical refracting surface. The medium beyond the surface has refractive index 1.75 and the radius of curvature is +42 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 60 cm from the pole of a convex spherical refracting surface. The medium beyond the surface has refractive index 1.75 and the radius of curvature is +42 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=-60 cm, μ₂=1.75 and R=+42 cm: 1.75/v − 1/(-60) = (1.75−1)/42. Hence v=1470.00 cm.