Q. Figure s (a) and (b) show refraction of a ray in air incident at 60°with the normal to a glass
![1979_Predict the angle of refraction in glass5.png](https://www.expertsmind.com/CMSImages/1979_Predict%20the%20angle%20of%20refraction%20in%20glass5.png)
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
![1882_Predict the angle of refraction in glass.png](https://www.expertsmind.com/CMSImages/1882_Predict%20the%20angle%20of%20refraction%20in%20glass.png)
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
![1802_Predict the angle of refraction in glass1.png](https://www.expertsmind.com/CMSImages/1802_Predict%20the%20angle%20of%20refraction%20in%20glass1.png)
Using (1) as well as (2) the relative refractive index of glass with respect to water can be
Obtained as:
![442_Predict the angle of refraction in glass2.png](https://www.expertsmind.com/CMSImages/442_Predict%20the%20angle%20of%20refraction%20in%20glass2.png)
The subsequent figure shows the situation involving the glass-water interface.
![2329_Predict the angle of refraction in glass3.png](https://www.expertsmind.com/CMSImages/2329_Predict%20the%20angle%20of%20refraction%20in%20glass3.png)
Angle of incidence, i=45°
Angle of refraction=r
From Snell's law, r can be calculated as:
![424_Predict the angle of refraction in glass4.png](https://www.expertsmind.com/CMSImages/424_Predict%20the%20angle%20of%20refraction%20in%20glass4.png)
Hence, the angle of refraction at the water-glass interface is 38.68°.