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A ball is set rolling down an inclined plane of angle 440 as shown. A mirror M is to be placed at the lower edge of the incline such that the image of the ball is seen to be moving downward in exactly vertical direction. Then the angle  which is made between the incline and the mirror is · · ·. Express your answer in degree.

A ball is set rolling down an inclined plane of angle 440 as shown. A mirror M is
to be placed at the lower edge of the incline such that the image of the ball is seen to be
moving downward in exactly vertical direction. Then the angle  which is made between
the incline and the mirror is · · ·. Express your answer in degree.

Grade:10

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