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Focal lengths of objective and eye-piece of microscope is 1.6 cm and 2.5 cm respectively. Distance between two lenses is 21.7 cm. If final image is formed at infinity, then magnification m = ...... |
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Answer» 11  For objective`(1)/(v_0)-(1)/(u_0)=(1)/(f_0)` `therefore (-1)/(u_0)=(1)/(f_0)-(1)/(v_0)` `therefore (-1)/(u_0) =(19.2-1.6)/((1.6)(19.2))` `therefore u_0=-1.745`cm When IMAGE is FORMED at INFINITY magnification `m=((v_0)/(u_0))((D)/(f_e))` where D=25 cm `=((19.2)/(1.745))((25)/(2.5))` `therefore m=110` cm |
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