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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsDiffractionEasy2 minPYQ_2020

PhysicsEasysingle choice

A slit of width $a$ is illuminated by white light. The first minimum for red light $λ = 6500 Å$ will fall at $θ = 30^{o}$ , when $a$ is

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Answer:

Solution:

$\sin θ = \frac{λ}{a}$

$\Rightarrow \sin 30^{o} = \frac{6500}{a} \overset{°}{A}$

$∴ \frac{1}{2} = \frac{6500}{a} Å$

$∴ a = 2 \times 6500 Å = 2 \times 6500 \times 10^{- 10} m$

$∴ a = 1.3 \times 10^{- 6} m = 1.3 μm$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:Diffraction

⏱ 2mℹ️ Source: PYQ_2020

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