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    				| 1. | 
                                    (i) Define the power of a lens.(ii) The lens mentioned in 6(b) above is of focal length 25 cm. Calculate the power of the lens. | 
                            
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Answer»  (i) The power of a lens is a measure of deviation produced by it in the path of rays refracted through it. (ii) power of lens (in D) = (1/Focal length (in meter)) = (100/Focal length (in centimetre)) = (100/25) = 4D  | 
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