AP EAMCET · PHYSICS · Wave Optics

A mixture of Yellow light of wavelength $580 nm$ and blue light of wave length $450 nm$ is incident normally on an air film of thickness $2.9 \times 10^{-4} \mathrm{~mm}$. The colour of reflected light is

A Red
B Blue
C Violet
D Yellow

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Answer & Solution

Correct Answer

(D) Yellow

Step-by-step Solution

Detailed explanation

Using the bragg's law the path difference for first reflected light, The thickness of film is d=2.9×10-4 mm The angle between the incident ray and film is 90° Therefore,…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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A mixture of Yellow light of wavelength $580 nm$ and blue light of wave length $450 nm$ is incident normally on an air film of thickness \(2.9 \times 10^{-4} \mathrm{~mm}\). The colour of reflected light is

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A mixture of Yellow light of wavelength 580nm and blue light of wave length 450nm is incident normally on an air film of thickness \(2.9 \times 10^{-4} \mathrm{~mm}\). The colour of reflected light is

Step-by-step Solution

A mixture of Yellow light of wavelength $580 nm$ and blue light of wave length $450 nm$ is incident normally on an air film of thickness \(2.9 \times 10^{-4} \mathrm{~mm}\). The colour of reflected light is