Q. Figure s (a) and (b) show refraction of a ray in air incident at 60°with the normal to a glass
Answer
According to the given figure for the glass-air interface:
>>Angle of incidence i=60°
>>Angle of refraction r=35°
>>A relative refractive index of glass with respect to air is given by Snell's law as
According to the given figure for the air-water interface:
Angle of incidence i=60°
Angle of refraction r=47°
>>A relative refractive index of water with respect to air is given by Snell's law as
Using (1) as well as (2) the relative refractive index of glass with respect to water can be
Obtained as:
The subsequent figure shows the situation involving the glass-water interface.
Angle of incidence, i=45°
Angle of refraction=r
From Snell's law, r can be calculated as:
Hence, the angle of refraction at the water-glass interface is 38.68°.