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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

In a given region of $10$ fringes are observed in the reflected beam from a thin film. If the wavelength of the incident light is changed from $4200 \overset{\circ}{A}$ to $6000 \overset{\circ}{A}$ , then the number of fringes observed in the same region will be

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Answer:

Solution:

Path difference $2 μ t \cos r = n λ$

Path difference is the same for both waves

$∴ n_{1} λ_{1} = n_{2} λ_{2}$

Or $n_{2} = n_{1} \frac{λ_{1}}{λ_{2}} = \frac{10 \times 4200}{6000} = 7$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave OpticsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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