
Concept explainers
(a)
The maximum angle of incidence for which the phenomena of total internal reflection occurs at the left vertical surface.
(a)

Answer to Problem 35.68AP
Explanation of Solution
Given Info: The light of wavelength
The refractive index of the polystyrene is
Figure (I)
For total internal reflection from the left vertical surface the angle of incidence for the vertical surface must be greater than the critical angle.
The formula to calculate the critical angle is,
Here,
Substitute
From equation (1) the value of the angle
From Figure (1) in triangle
Substitute
Thus the value of
Formula to calculate the value of
Here,
Substitute
As the angle
Thus any value of
Conclusion:
Therefore, total internal reflection will occur at the left vertical surface for any angle less than
(b)
The angle of incidence if the polystyrene slab is immersed in water.
(b)

Answer to Problem 35.68AP
Explanation of Solution
Explanation
Given info: The refractive index of water is
For the polystyrene slab surrounded in water the value of critical angle is,
Substitute
The value of
From figure (1) in triangle
Substitute
From Snell’s Law, calculate the value of the angle of incidence.
Here,
Substitute
Thus when the polystyrene slab is immersed in water the angle of incidence is
Conclusion:
Therefore, the total internal reflection will occur for angle of incidence
(c)
The angle of incidence for the phenomena of total internal reflection if the polystyrene slab is immersed in carbon disulphide.
(c)

Answer to Problem 35.68AP
Explanation of Solution
Explanation
Given info: The refractive index of carbon disulphide is
The phenomena of total internal reflection only takes place when the light ray is travelling form a higher refractive index material to a low refractive index material.
For the case where the polystyrene slab is immersed in the carbon disulphide the light ray at the interface of the left vertical wall will not undergo the total internal reflection as at the interface the light will be propagating form a lower refractive index material to a higher refractive material and for the phenomena of total internal reflection to occur the light must be travelling form higher refractive index material to a low refractive index material.
Hence, the phenomena of total internal reflection will not take place when the slab is immersed in carbon disulphide.
Conclusion:
Therefore, the phenomena of total internal reflection will not take place when the slab is immersed in carbon disulphide.
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Chapter 35 Solutions
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