Q3 of 27 Page 442

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because slit.

A parallel beam of light is required to be incident on the dispersing element to produce a pure spectrum. So, that incident light can be passed through a narrow slit placed in the focal plane of an achromatic lens.

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1

A narrow beam of white light goes through a slab having parallel faces.

 2

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 4

Which of the following quantities related to a lens depend on the wavelength or wavelengths of the incident light?

 5

Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.