Question
An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer the tree appears:
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10 times taller.
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10 times nearer.
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20 times taller.
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20 times nearer
Solution
C.
20 times taller.
The height of image depends upon magnifying rows to see 20 times taller object, angular magnification should be 20 and we observe angular magnification option (c) would not be very correct as the telescope can be adjusted to form the image anywhere between infinity and least distance for distinct vision.Suppose that the image is formed at infinity. Then. the observer will have to focus the eyes at infinity to observe the image. Hence, it is incorrect to say that the image will appear nearer to the observer.
