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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsYDSEEasy2 minPYQ_2020

PhysicsEasysingle choice

Two coherent point sources $S_{1}$ and $S_{2}$ vibrating in phase emit light of wavelength $λ .$ The separation between them is $2 λ .$ The light is collected on a screen placed at a distance $D > > λ$ from the slit $S_{1}$ as shown. The minimum distance, so that intensity at $P$ is equal to the intensity at $O$

Options:

Answer:

Solution:

Path difference between the light waves form $S_{1} a n d S_{2},$ reaching at $P$ is,

$= 2 λ c o s θ$

Since, there is a bright maximum at $O$ . Thus for maximum at $P,$

$2 λ c o s θ = n λ$

For $x$ to be minimum $n = 1$

$c o s θ = \frac{1}{2} \Rightarrow θ = 60 °$

$∴ x = D t a n 60 ° = \sqrt{3} D$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:YDSE

⏱ 2mℹ️ Source: PYQ_2020

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