Question:
When a beam of white light enters into an optical prism, the most deviated colour is ________.
When a beam of white light enters into an optical prism, the most deviated colour is ________.
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VIBGYOR: Violet deviates most (shortest $\lambda$), Red deviates least (longest $\lambda$).
Updated On: Jun 26, 2026
- green
- violet
- yellow
- red
- blue
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Refraction and dispersion occur when light enters a prism, where the angle of deviation depends on the wavelength.
Step 2: Meaning
Cauchy's equation states that the refractive index $\mu$ is higher for shorter wavelengths.
Step 3: Analysis
Violet light has the shortest wavelength in the visible spectrum, meaning it experiences the highest refractive index and slows down the most.
Step 4: Conclusion
Because it slows down the most, violet light undergoes the greatest deviation from its original path. Final Answer: (B)
Refraction and dispersion occur when light enters a prism, where the angle of deviation depends on the wavelength.
Step 2: Meaning
Cauchy's equation states that the refractive index $\mu$ is higher for shorter wavelengths.
Step 3: Analysis
Violet light has the shortest wavelength in the visible spectrum, meaning it experiences the highest refractive index and slows down the most.
Step 4: Conclusion
Because it slows down the most, violet light undergoes the greatest deviation from its original path. Final Answer: (B)
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