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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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:

G1 Physics · Accepted Answer

Derived solution: Step 1: For an astronomical telescope use angular magnification |M| = fₒ/fₑ and, in normal adjustment, tube length = fₒ + fₑ. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 20 times nearer. Therefore the correct option is A.