Critical Angle
Critical angle c for medium (n) to air (n≈1) satisfies?
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About This Question
- Subject
- physics
- Chapter
- optics
- Topic
- critical angle
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
sin c = 1/n
- Condition for Critical Angle: Light must travel from a denser medium (n1=n) to a rarer medium (n2=1).
- Definition: The critical angle (c) is the angle of incidence for which the angle of refraction is exactly 90∘.
- Application of Snell's Law: n1sinθ1=n2sinθ2.
- Substitution:
- nsinc=(1)×sin90∘
- nsinc=1
- Rearrange: sinc=n1.
- Significance: For any angle θ>c, Total Internal Reflection occurs.
This easy difficulty physics question is from the chapter optics, covering the topic of critical angle. It appeared in the 2025 exam.
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