Physics · Total internal reflection and its applications, magnification, power of a lens, combination of thin lenses in contact
A ray of light in a liquid of refractive index approaches the boundary surface b
A ray of light in a liquid of refractive index \( 1.4, \) approaches the boundary surface between the liquid and air at an angle of incidence whose sine is 0.8 Which of the following statements is correct about the behaviour of the light
- A. It is impossible to predict the behaviour of the light ras on the basis of the information supplied.
- B. The sine of the angle of refraction of the emergent ray will less than 0.8
- C. They ray will be internally reflected.
- D. The sine of the angle of refraction of the emergent ray will be greater than 0.8
Step-by-step solution
The critical angle for the liquid-air interface is given by sin C = 1/1.4 ≈ 0.714. Since sin i = 0.8 > sin C, the incident angle exceeds the critical angle, causing total internal reflection.
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