NEET Class neet Answered
please answer this
Asked by Prashant DIGHE | 29 Jan, 2020, 10:23: PM
Expert Answer
magnification m of compound microscope is given by, m = mo me = ( L/fo ) [ 1 + ( D/fe ) ]
where mo is magnificaion of objective lens that depends on tube length L and focal length fo of objective lens .
where me is magnification produced by eye-piece that depends on D = 25 cm which is near point of comfortable
viewing and fe is the focal length of eye piece.
we are given m = 375, L = 150 mm, fo = 5 mm
hence [ 1 + ( D/fe ) ] = ( 375 × 5 ) / 150 = 12.5
hence ( D/ fe ) 11.5 ; fe = 250 / 11.5 ≈ 22 mm
Answered by Thiyagarajan K | 30 Jan, 2020, 04:30: PM
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