A ray of light is incident on an air-glass boundary at an angle (theta). If the angle between the partially reflected ray and the refracted ray is 90°, calculate (theta), given that the refractive index of glass is 1.50.
Explanation
n = (frac{sin i}{sin r})
1.5 = (frac{sin theta}{sin(190 – theta)} = frac{sin theta}{cos theta} = tan theta)
Hence, 0 = tan(^{-1}) 1.5 = 56.31(^o)