Question

Deduce the condition for achromatism in two thin lenses in contact

Answer 1

Condition for achromatism is that " The ratio of the dipersive power must be equal to the ratio of the focal length of the two lenses." i.e, w1/w2 = f1/f2 where, w1 and w2 are the dispersive power of the two lenses and f1 and f2 are the focal lengths.

Answer 2

Answer:

Condition for achromatism is that " The ratio of the dipersive power must be equal to the ratio of the focal length of the two lenses." i.e, w1/w2 = f1/f2 where, w1 and w2 are the dispersive power of the two lenses and f1 and f2 are the focal lengths.