A ray of light is incident at the glass-water interface at an angle i , it emerges finally parallel to the surface of water, then the value of μg would be

 

  • Option 1)

    (4/3)sin(i)

  • Option 2)

    1/sin(i)

  • Option 3)

    4/3

  • Option 4)

    1

 

Answers (1)

 

Relation between angle of incidence and angle of refraction -

\mu _{1}\sin i= \mu _{2}\sin r
 

- wherein

\mu _{1}= refractive index of medium of incidence.

\mu _{2}=  refractive index of medium where rays is refracted.

i= angle of incidence.

r= angle of refraction.

 

 at water - air interfac

\mu _{w}= \frac{1}{\sin r}

or  sin r = \frac{3}{4} ----------------(1)

at water glass interface

\mu _{g}.\sin i = \mu _{w}.\sin ror

\mu _{g} = \frac{4}{3\sin i}.\frac{3}{4} = \frac{1}{\sin i}

 

 

 

 

 


Option 1)

(4/3)sin(i)

Incorrect

Option 2)

1/sin(i)

Correct

Option 3)

4/3

Incorrect

Option 4)

1

Incorrect

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