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A concave mirror of radius of curvature 40 cm is filled with water (n=4 / 3) upto a height of 12 cm . A point object O is kept on the principal axis of the mirror at height 13.5 cm from the water surface. The final image formed w.r.t water surface (in cm ) after refraction at water surface, reflection at mirror and again refraction at water surface in succession is .

Correct answer

36

Step-by-step solution

P^ =13.5 4 / 3=18 ~cm aligned & 1 v₂ + 1 v₂ = 1 f & 1 v₂ - 1 30 =- 1 20 aligned v₂=-60 ~cm from point, P final image gets formed at =(60-12) 3 / 4=36 ~cm

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