Ray of light strikes the mirror at an angle of 60°.
⇒ It will make an angle of 300 (900 – 600) with the normal.
∴ Angle of incidence = 300.
Now, By laws of refraction;
µ = \(\frac{Sin\,i}{Sin\,r}\)
Angle of incidence is 60°
Refractive index of glass slab is 1.5
Putting the value in the above equation, we get
1.5 = \(\frac{0.866}{sin\,r}\)
On solving the above equation, we get
sin r = \(\frac{0.866}{1.5}\)
Angle of refraction, r= 35.26°
Thus the angel of refraction is 35.26° from the normal.