question_answer 4)

The following figures (a) and (b) showrefraction of an incident ray in air at 60° withthe normal to glass-air and water-air interface,respectively. Predict the angle of refraction ofan incident ray in water at 45° with the normalto a water-glass interface   (a)                                          (b) (c)  

Answer:

From fig. (a),                     From fig (b), or