and "Reason" (R) Type questions. Use the following Key to choose the appropriate answer. If both and (R) are true, and (R) is the correct explanation of . and (R) are true but (R) is not the correct explanation of . is true but (R) is false is false but (R) is true. (i) Assertion : A ray incident along normal to the mirror retraces its path. Reason : In reflection, angle of incidence is always equal to angle of reflection. (ii) Assertion : The twinkling of star is due to reflection of light. Reason : The velocity of light changes while going from one medium to the other. (iii) Assertion : A bird in air is diving vertically with speed v 0 over a tank filled with water and having flat silvered bottom serving as plane mirror, it observes velocity of its image in silvered bottom of tank as 2v 0 upward relative to itself. Reason : Bird and its image in bottom mirror are always equidistant from bottom mirror.

If both

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If