Q. 5

Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.
A. The power of a converging lens.

B. The focal length of a converging lens.

C. The power of a diverging lens.

D. The focal length of a diverging lens.

Answer :

Focal length of a lens is inversely proportional to the refractive index of a lens. Refractive index is also inversely proportional to the square of wavelength. Thus, we can conclude that the focal length is directly proportional to wavelength; it increases when the wavelength is increased.

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