Concept explainers
(a)
To explain: The advantage of the many slits for diffraction grating.
(a)
Answer to Problem 19Q
Using many slits for diffraction grating, will increase interference.
Explanation of Solution
Introduction: The pattern resulting from superimposing of two waves is known as interference. Interference can be destructive or constructive. The separation of polychromatic light into its constituent wavelength is termed as diffraction grafting.
Destructive interference occurs after the crest of a wave overlaps the trough of another wave. The waves destructively interfere and also, cancel each other, once crest of one & trough of other interfere.
Diffraction gratings are employed to make accurate measurements of
(b)
To explain: The advantage of closely spaced slits for diffraction grating.
(b)
Answer to Problem 19Q
The closely packed slits diffracted the light at larger angle and measurement can be very easy.
Explanation of Solution
Introduction: The pattern resulting from superimposing of two waves is known as interference. Interference can be destructive or constructive. The separation of polychromatic light into its constituent wavelength is termed as diffraction grafting.
Destructive interference occurs after the crest of a wave overlaps the trough of another wave. The waves destructively interfere and also, cancel each other, once crest of one & trough of other interfere.
Diffraction gratings are employed to make accurate measurements of wavelength of light. According to this, advantage of having tightly spaced slits in the diffraction grating is that this spreads out bright maxima in interference pattern and also, makes them easier to measure.
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