Question

If an incident
ray fall normally on a smooth plane surface, then angle of incidence becomes :
equal to 0°
greater than 90°
equal to 90°
greater than 0°
​

Answer 1

Answer:

sorry don't know the answer

Answer 2

If an incident ray falls normally on a smooth plane surface then angle of incidence becomes equal to 0°.

• A ray is normally falling upon a smooth surface, means the light ray is falling through the straight line of the normal.
• Now, the incidence angle is the angle between the normal and the incident ray.
• Here, the normal and incident ray are collinear. Thus the angle between them is 0°.
• That's why, the incidence ray will be also 0° in this case.