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JEE PHYSICS MCQ: WAVE OPTICS

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Application +4 | -1

Red light of wavelength

625\;nm

is incident normally on an optical diffraction grating with

2 \times {10^5}\;lines/m

. Including central principal maxima, how many maxima may be observed on a screen which is for from the grating?

View answer and explanation

Correct option: B

17

Option B (17) is correct because the number of maxima is determined by the grating equation and the condition that

\sin \theta

must be less than or equal to 1.

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