l.r.
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I’m stuck on the GCSE isaac physics question 47.9, it reads:
‘A thin ray of monochromatic light enters a block of pure ice at an angle of 42.0 degrees to the normal from the air and and the refracted angle in the ice is 30.7 degrees.
Calculate the critical angle for ice.’

Would anyone be able to help?
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username5737602
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Use smells law to work out the refractive index of the ice. Then use the refractive index of ice, and the fact that the refractive index of air is 1, to find the critical angle (hint: the critical angle occurs when the angle of refraction is 90°)
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