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The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm . The maximum magnifying power of the telescope will beA. `-100`B. `-60`C. `-48`D. `-40` |
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Answer» Correct Answer - C Magnifying power , `M=f_0/(f_e) (1+ (f_e)/d)` Least distance of distinct vision , d= 25 cm `M=-200/5 (1+5/25) =-40 (1+1/5)` `=-40 (6/5)` =-48 cm . |
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