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index of the prism material for violet light is 1.651

calculate:

(a) The angle of refraction for the air-glass boundary

(b) The critical angle for violet leaving the glass

(c) The velocity of the violet light in the prism

any help would be great.

at the moment im on a)

i know that n=sin(i°)/sin(r°)

the wavelength of light is n=λair/λmedium( violet light)

= 1/1.651 = 0.6

sin(r)=sin(60)/0.6 = 1.4 but when i try to get the angle i get nothing.