Question

Which among the following is the correct option about the laws of reflection of light?​

• A. Angle of reflection is ${60}^{\circ }$ .
• B. Angle of incidence is ${30}^{\circ }$.
• C. Angle of reflection is ${90}^{\circ }$.
• D. Angle of incidence is ${60}^{\circ }$.

Answer 1

The correct option is B Angle of incidence is ${30}^{\circ }$.

When a light ray makes an angle of 60 degrees with the surface it makes a 30-degree angle with the normal to the surface.
Thus the angle of incidence is 30 degrees.
From laws of reflection Angle of incidence = Angle of reflection, so the angle of reflection is 30 degrees.
Hence the answer is Option C