NEET UG PHYSICS MCQ: WAVE OPTICS

1 Easy

1 of 1

Application +4 | -1

The diffraction pattern of a light of wavelength

400 \mathrm{~nm}

diffracting from a salt of width

0.2 \mathrm{~mm}

is focused on the focal plane of a convex lens of focal length

100 \mathrm{~cm}

. The width of the

1^{\text {st }}

secondary

View answer and explanation

Correct option: B

2 \mathrm{~mm}

The correct answer is B (2 mm) because the width of the first secondary maximum in a single-slit diffraction pattern is twice the distance from the central maximum to the first minimum.

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