MHT CET 2026 Physics question

Physics Ray Optics and Optical Instruments MHT CET 2026

If a parallel beam of light is incident on spherical mirrors then after reflection they pass through focal point. If F is the focal length and R is the radius of curvature of mirror then

(A)R = F
(B)R = 2FCorrect
(C)R = F/2
(D)R = F/4

Answer: (B)

Solution

For a spherical mirror of small aperture, rays parallel to the principal axis converge (concave) at, or appear to diverge from (convex), the principal focus. The geometry of reflection (angle of incidence equals angle of reflection) shows that the focus

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-097658