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Ray optics

A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm. Find the focal length of the eye- piece


When final image is at infinity the magnification produced by eye piece is Dfe  and  ve=fe

L=vo+ue   1Vo+1uo=1fo

6.5=Vo+fe    vou0+1=vofo


Overall magnification  v0uoDfe=100






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