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A parallel beam of white light falls on a combination of a concave and convex lens, both of same material. Their focal lengths are $15$ cm and $30$ cm respectively for the mean wavelength in white light. On the other side of the lens system one sees,

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that it is not possible for the lens to converge the rays at a point.

white light again

a colored pattern with red at the outer edge

a colored pattern with violet at the outer edge

answer is A, D.

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Detailed Solution

$\frac{1}{f} = \frac{1}{- 15} + \frac{1}{30}$

$\Rightarrow f = - 30 c m$ (Diverging in nature) , .So OPTION $(4)$ is right .

Since red deviates the least and violet deviates the maximum. So, a colored pattern with violet on the outer side is observed.

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