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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsDiffractionEasy2 minPYQ_2020

PhysicsEasysingle choice

A single slit Fraunhofer diffraction pattern is formed with white light, for what wavelength of light, the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for the red light of wavelength $6500 \overset{\circ}{A}$ ?

Options:

Answer:

Solution:

$∵ x = \frac{(2 n + 1)}{2 a} λ D$

For red light, $x = \frac{(4 + 1)}{2 a} \times 6500 \overset{\circ}{A} \times D$

For other light, $x = \frac{(6 + 1)}{2 a} D \times λ$

$∵$ x is the same for each

$∴ 5 \times 6500 = 7 λ$

$λ = \frac{5}{7} \times 6500$

$= 4642. 8 \overset{\circ}{A}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:Diffraction

⏱ 2mℹ️ Source: PYQ_2020

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