Geometric Optics: Bird and Fish Problem

A bird in air is diving vertically over a tank with speed 6 cm/s. Base of tank is silvered. A fish in the tank is rising upward along the same line with speed 4 cm/s. Water level is falling at rate of 2 cm/s. (Refractive index of water = 4/3)

Column – I                                                                                                                                  Column – II

(A) The speed of the image of the fish as seen by the bird directly                                                        (p) 12

(B) The speed of the image of fish formed after the reflection from the mirror as seen by the bird (q) 4

(C) The speed of the image of the bird relative to the fish looking upwards                                         (r) 9

(D) The speed of the image of the bird relative to the fish looking downward in the mirror               (s) 3

 

 

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