Refraction at Spherical SurfaceMediumQuestion 20221
Question
Refraction formula at a single spherical surface separating media n₁ (object side) and n₂ is:
- An₁/v + n₂/u = (n₂−n₁)/R
- Bn₂/v − n₁/u = (n₂−n₁)/RCorrect
- Cn₁/u + n₂/v = (n₁−n₂)/R
- Dn₂/v + n₁/u = (n₁+n₂)/R
Correct answer
n₂/v − n₁/u = (n₂−n₁)/R
Explanation
Standard formula for refraction at a spherical surface: n₂/v − n₁/u = (n₂−n₁)/R. The sign of R follows the convention (positive if centre of curvature is on transmission side).