1.

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.​

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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