A convex lens has mean focal length of 20 cm. The dispersive power of the material of the lens is 0.02. The longitudinal chromatic aberration for an object at infinity isA. `10^(3)`B. 0.8C. 0.4D. 0.2

A convex lens has mean focal length of 20 cm. The dispersive power of

1.	A convex lens has mean focal length of 20 cm. The dispersive power of the material of the lens is 0.02. The longitudinal chromatic aberration for an object at infinity isA. `10^(3)`B. 0.8C. 0.4D. 0.2
Answer» Correct Answer - C (c ) The separation between the images formed by extreme wavelengths of visible range is called the longitudinal chromatic Is given by, `f_(1)-f_(2)=omegaxxf` Where, `omega` is dispersive power Given, `pmega=0.02,f=20cm` `because f_(1)-f_(2)=0.02xx20=0.40`

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A convex lens has mean focal length of 20 cm. The dispersive power of the material of the lens is 0.02. The longitudinal chromatic aberration for an object at infinity isA. `10^(3)`B. 0.8C. 0.4D. 0.2

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