Answer this ????

(i) If the angle of incidence is 0o, the light will fall normally on the interface and hence there will be no deviation due to refraction and the angle of refraction = 0o.
(ii) Given, 
Critical angle for the system = 30o.
When light is travelling from a denser to a rarer medium and is incident at an angle equal to the critical angle, the angle of refraction is 90o.

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