Wave Optics

JEE Main level, single correct, medium

139 of 191

Question 139 of 191

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1μm.0.1\mu m. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that

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Answer: (C) its size decreases, but intensity increases

sin⁡θ=mλa\sin \theta =\dfrac{m\lambda }{a}
when a increases, θ\theta decreases,
width decreases
width decreases so intensity will increases

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