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The figure shows a plane mirror PQ at distance 20 cm from an object. The mirror is moved 15 cm away from object O to next position. What is the shift in the image of O? |
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Answer» Given that at first the object 20 cm from the mirror. So the image is also at a distance of 20 cm from mirror (Since object distance = image distance). Now the mirror is moved 15 cm away from the object. So the image also moves 15 cm away from actual image distance before. So now the image distance is 35 cm. Therefore the image is 70 cm from the object. |
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