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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsDiffractionEasy2 minPYQ_2020

PhysicsEasysingle choice

A parallel beam of light of wavelength $600 nm$ is incident normally on a slit of width $a .$ If the distance between the slit and the screen is $0.8 m$ and the distance of 2^ndorder minimum from the centre of the screen is $1.5 mm,$ calculate the width of the slit.

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Answer:

Solution:

Given $λ = 600$ nm $= 600 \times 10^{- 9} m.$

$= 6 \times 10^{- 7} m$

$D = 0.8 m, x = 1.5 mm = 1.5 \times 10^{- 3} m, n = 2, a = ?$

$∵ a \frac{x}{D} = n λ$

$a = \frac{n λ D}{x} = \frac{2 \times 6 \times 10^{- 7} \times 0.8}{1.5 \times 10^{- 3}} = \frac{9.6 \times 10^{- 4}}{1.5}$

$= 6.4 \times 10^{- 4} m$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:Diffraction

⏱ 2mℹ️ Source: PYQ_2020

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