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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsDiffractionEasy2 minPYQ_2020

PhysicsEasysingle choice

The interference pattern is observed at $P$ due to the superposition of two rays coming out from a source $S$ as shown in the diagram. The value of $l$ for which maxima is obtained at $P$ is, (Given that $R$ is a perfect reflecting surface)

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Answer:

Solution:

$Δ x = \frac{4 l}{\sqrt{3}} + \frac{λ}{2} - 2 l = n λ$ for construction interference.

$\frac{λ}{2}$ is added due to reflection from denser medium.

$\Rightarrow l = \frac{n λ - \frac{λ}{2}}{\frac{4}{\sqrt{3}} - 2} = \frac{\sqrt{3} (2 n - 1) λ}{4 (2 - \sqrt{3})}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:Diffraction

⏱ 2mℹ️ Source: PYQ_2020

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