A spherical surface separates two media of refractive indices 1 and 1.5 as shown in the original figure. The object is 0.2 m to the left of the surface and the centre of curvature is 0.4 m to the right of the surface. The image is formed at:

Question

G1 Physics · Accepted Answer

Use refraction at a spherical surface: μ₂/v - μ₁/u = (μ₂-μ₁)/R. Take positive direction to the right. μ₁=1, μ₂=1.5, u=-0.2 m, R=+0.4 m. Thus 1.5/v - 1/(-0.2) = (1.5-1)/0.4. So 1.5/v + 5 = 1.25 ⇒ 1.5/v = -3.75 ⇒ v = -0.4 m. Negative v means the image is on the left side of the spherical surface. Therefore the image is 0.4 m to the left. Correct option: B.