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## Homework Statement

Calculate the angle of incidence for an angle of refraction of 10° for

a) Diamond (2.42) to air

θ2=Angle of refraction=10°

n2=Index of refraction on refractive medium=1

n1=index of refraction on incident medium=2.42

θ1=?

## Homework Equations

n1sinθ1=n2sinθ2

## The Attempt at a Solution

The book's answer tells me the answer is 24.8°

I rearranged the equation to find theta1 or the angle of incidence

θ1=sin inverse(n2sinθ2/n1)

I substituted the values and I got 4.1°

Can someone help me? I can't figure out what I did wrong. Light is coming from a dense medium to a less dense medium (diamond to air) so where the incident ray originated from the dense medium which is n2. So confused..