The angle if refraction also increases.

The COEFFICIENT of Refraction.

The angles of light are the result of the law of sines:

sine( incidence angle)/speed of incidence = sine(refraction angle)/ speed of refraction

Not exactly, the angle of refraction = the angle of incidence, which means the ratio of sine of angle of incidence to the sine of angle of refraction is constant for two media.

That is sin i /sin r = constant , and this constant is called refractive index

nwater * sin 30=nair *sin(angle of refraction) 1.33*0.5=1*sin(angle of refraction) sin(angle of refractiob)=0.665 angle of refraction inair=41.6 degrees nwater * sin 30=nair *sin(angle of refraction) 1.33*0.5=1*sin(angle of refraction) sin(angle of refractiob)=0.665 angle of refraction inair=41.6 degrees