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Obtain the equation of magnification of combination of lenses. |
Answer» Solution :Suppose `m_1`, and `m_2`, MAGNIFICATION o combination of two LENSES are as shown in figure As shown in the figure for CONVEX lens L, object distance = OP = U image distance = PI. = v. and PI = v Similarly, for convex lens `I_2` object distance = PI.= v. image distance = PI = v From the figure, For lens `L_1` magnification, `m_1 = (v.)/(u)` ... (1) For lens `L_2` magnification, `m_2 = (v)/(v.)` ... (2) Now magnification for the lens combination, `m=v/u` `therefore v/u=(v)/(v.)xx(v.)/(u)` `therefore m=m_2xxm_1` If a combination consists of more than two lenses, `therefore m = m_1 xx m_2 xx m_3 .......... xx m_n` |
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