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An object ' O ' is placed at a distance of 100 cm in front of a concave mirror of radius of curvature 200 cm as shown in the figure. The object starts moving towards the mirror at a speed 2 cm s - 1 . The position of the image from the mirror after 10 s will be at _____ cm .

Correct answer

0

Step-by-step solution

In 10   s , the object will travel distance = 2 × 10 = 20   cm After 10   sec , the object will be at distance u = 20 - 100 = - 80   m . Focal length of the concave mirror is f = R 2 = 200 2 = - 100   cm Using mirror formula, 1 v + 1 u = 1 f ⇒ 1 v = - 1 100 + 1 80 ⇒ v = 8000 20 ⇒ v = 400   cm Position of image from the mirror is at 400   cm .

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