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Draw the ray diagram of image formed by convex lens having focal length 2cm. If lighting candle is placed 4cm from the lens, calculate the magnification of the lens. |
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Answer» In the above diagram,L 1 and L 2 are two CONVEX lenses, O be the point object and I 1 and I 2 are the IMAGES obtained by the lens L 1 and L 2 . Let P 1 and P 2 are the power of the lenses, and f 1 andf 2 are the focus length of the two lenses then, f 1 1 = v 1 1 − u 1 −−−−−−−−−−(1) f 2 1 = v 1 − v 1 1 −−−−−−−−−−(2) By adding the EQUATION (1) and (2) v 1 − u 1 = f 1 1 + f 2 1 So, We know that , P= f 1 So P= f 1 1 + f 2 1 Then, P=P 1 +P 2 .Explanation: |
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