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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsDiffractionEasy2 minPYQ_2020

PhysicsEasysingle choice

A single slit of width $0.1 mm$ is illuminated by a parallel beam of light of wavelength $6000 Å$ and diffraction bands are observed on a screen $0.5 m$ from the slit. The distance of the third dark band from the central bright band is:

Options:

Answer:

Solution:

$a = 0.1 mm = 10^{- 4} m$

$λ = 6000 \times 10^{- 10} = 6 \times 10^{- 7} m$

$D = 0.5 m$

For $3^{r d}$ dark

$a \sin θ = 3 λ$

$\sin θ = \frac{3 λ}{a} = \frac{x}{D}$

$x = \frac{3 λ D}{a}$

$= \frac{3 \times 6 \times 10^{- 7} \times 0.5}{10^{- 4}}$

$= 9 mm$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:Diffraction

⏱ 2mℹ️ Source: PYQ_2020

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