Optics 3 Question 32

32. A parallel beam of white light fall on a combination of a concave and a convex lens, both of the same material. Their focal lengths are 15cm and 30cm respectively for the mean wavelength in white light. On the same side of the lens system, one sees coloured patterns with violet colour nearer to the lens.

(1988,2M)

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Answer:

Correct Answer: 32. T

Solution:

  1. Focal length of concave is less, i.e. power of concave lens will be more. Hence, the combination will behave like a concave lens. Further, μV is greater than all other colours. Hence, fV will be least.



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