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.

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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