Two objects A and B are placed 15 cm and 25 cm from the pole of a concave mirror of radius of curvature 40 cm. The distance between their images is:
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Question

Two objects A and B are placed 15 cm and 25 cm from the pole of a concave mirror of radius of curvature 40 cm. The distance between their images is:

G1 Physics · Accepted Answer

For the concave mirror: f = -R/2 = -20 cm Mirror formula: 1/f = 1/v + 1/u For u₁ = -15 cm: 1/v₁ = -1/20 + 1/15 = 1/60 v₁ = +60 cm For u₂ = -25 cm: 1/v₂ = -1/20 + 1/25 = -1/100 v₂ = -100 cm The images lie on opposite sides of the mirror, so separation: d = 60 + 100 = 160 cm Hence option C.