Question

The focal length of a convex lens is?
A. the same for all colours B. maximum for yellow light C. shorter for blue light than for red D. shorter for red light than for blue

Answer 1

Heya,

The answer to your question is :

The correct answer is C. shorter for blue light than for red light.

Regards,

Kshitij.

Answer 2

Answer:

C SHORTER FOR BLUE LIGHT THAN FOR RED

Explanation:

Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge. Hence, blue colour would have a shorter focal length, compared to red colour. Thus the focal length of a convex (or concave) lens is maximum for red colour.

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