The refractive index of the material of a prism is \sqrt{2}  and the angle of the prism is 30o. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is

  • Option 1)

    30o

  • Option 2)

    45o

  • Option 3)

    60o

  • Option 4)

    zero

 

Answers (1)
P Plabita

As we have learned

Angle of deviation through prism -

delta = i+e-A

- wherein

i= angle of incidence

e= angle of emergence

A= angle of prism

 

r=30 \degree

\sin i = \mu \sin 30 \degree

\sqrt2\cdot 1/2= 1/\sqrt2\Rightarrow i=45 \degree 

 

 

 

 


Option 1)

30o

This is incorrect

Option 2)

45o

This is correct

Option 3)

60o

This is incorrect

Option 4)

zero

This is incorrect

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