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**Snells law -- help please**

A light ray approaches a glass block at 30° to the normal. The refractive

indices of air and water are 1 and 1.5 respectively At what angle will the light

be refracted?

This uses Snells law

I did Sin 30 / Sin r = 1 / 1.5

I then multiplied both sides in order to get rid of sin 30.

After that, I got Sin r = 1/1.5(xSin30)

This gave me an answer of -1.48

When I do inverse sine it gives me an error

What did I do wrong???