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A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is
- a)red
- b)blue
- c)green
- d)violet
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A short pulse of white light is incident from air to a glass slab atno...
Explanation:
When a short pulse of white light is incident from air to a glass slab at normal incidence, it enters the glass slab and undergoes refraction. The different colors of light have different wavelengths and hence, they bend at different angles. This phenomenon is called dispersion of light.
The refractive index of the glass is different for different colors of light. The refractive index for red light is the least and for violet light is the highest. Thus, the red light bends the least and violet light bends the most.
Emerging color:
As the white light enters the glass slab, it gets dispersed into its constituent colors. The red light has the least deviation and hence emerges first. The other colors follow in the order of their deviation, with violet light emerging last.
Thus, the first color to emerge from the glass slab is red.
Conclusion:
Hence, the correct option is (a) red.
When a short pulse of white light is incident from air to a glass slab at normal incidence, it enters the glass slab and undergoes refraction. The different colors of light have different wavelengths and hence, they bend at different angles. This phenomenon is called dispersion of light.
The refractive index of the glass is different for different colors of light. The refractive index for red light is the least and for violet light is the highest. Thus, the red light bends the least and violet light bends the most.
Emerging color:
As the white light enters the glass slab, it gets dispersed into its constituent colors. The red light has the least deviation and hence emerges first. The other colors follow in the order of their deviation, with violet light emerging last.
Thus, the first color to emerge from the glass slab is red.
Conclusion:
Hence, the correct option is (a) red.
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Community Answer
A short pulse of white light is incident from air to a glass slab atno...
Velocity is directly proportional to wavelength,so red will emerge out first
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