Experts, please help me solve this question related to light ASAP...

Dear student,
(a)
(i) The angle of incidence is the angle which the incident ray makes with the normal.
∴∠i = 90°–30° = 60 °
 
(ii) Angle of refraction is the angle which the refracted ray makes with the normal.
∴∠r= 90°–45° = 45°
 
 
 
(b) According to Snell’s law,
 AirμLiquid = sini/sinr = sin60°/sin45° 
Or,    
airμliquid =  (√3/2)/(1/√2) = √3/√2
‚Äč 
 =1.22.

Regards

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