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Question

In the figure below a ray of light travelling in a medium of refractive index μ passes through two different rectangular blocks of refractive indices μ1 and μ2(μ2>μ1).
The angle of incidence θ1 is increased slightly. Then the angle
θ2
333180_b540dfdf4a4c4772b28849b003f163df.png

A
Increases
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B
Decreases
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C
Remains the same
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D
Increases or decreases depending on the value of \left ( μ1/μ2 )
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Solution

The correct option is B Decreases
Answer is B.

Following are the factors affecting Angle of deviation:
  • Angle of incidence
  • Angle of prism
  • Refractive index
  • Wavelength of light used.
From Snell's law, as the angle of incidence is increased, angle of deviation decreases and reaches minimum value. If the angle of incidence is further increased, the angle of deviation is increased.
Hence, as the angle of incidence θ1 is increased slightly, The angle θ2 decreases.

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