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For making a telescope two lenses of focal lengths 5 cm and 50 cm are to be used . Which lens will you use for objective ? |
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Answer» Solution :FOCUSSING for infinity the magnifying power of a telescope is GIVEN by, `m=(f_o)/(f_e)` Where `f_o` = focal length of the objective and `f_e` = focal length of the eyepiece so for higher magnifying power `f_o` should be GREATER than `f_e` Hence the lens of large focal length i.e ., 50 cm is to be used as objective . |
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