Question

If $i$ is the angle of incidence, the angle between the incident wave front and the normal to the reflecting surface is

• A. $i$
• B. ${90}^o-i$
• C. ${90}^o+i$
• D. $i-{90}^o$

Answer 1

Answer: (B)

${90}^o-i$

A case of wavefront incident on the reflecting surface is shown in the figure above. The line AE represents incident wavefront at time of incidence. The angle between the wavefront and normal to the reflecting surface here is ${90}^{\circ }-i$.