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A parallel beam of white light falls on ...

A parallel beam of white light falls on a combination of a concave and a convex lens, both of the same material. Their foacl lengths are 15cm and 30cm, respectively for the mean wavelength in white light. On the other side of the lens system, one sees colored patterns with violet color at the outer edge.

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To solve the problem step by step, we will analyze the situation involving a combination of a concave and convex lens and the behavior of light passing through them. ### Step 1: Identify the Focal Lengths We are given: - Focal length of the concave lens (f1) = -15 cm (negative because it is a concave lens) - Focal length of the convex lens (f2) = +30 cm (positive because it is a convex lens) ### Step 2: Calculate the Combined Focal Length ...
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