Question

If a ray of light incident on a plane mirror is such that it makes an angle of ${30}^o$ with the mirror, then the angle of reflection is:

• A. ${30}^o$
• B. ${4.5}^o$
• C. ${55}^o$
• D. ${60}^o$

Answer 1

The correct option is D ${60}^o$

If a ray of light incident on a plane mirror is such that it makes an angle of ${30}^o$ with the mirror, then the angle of incidence with the normal is ${90}^o$ - ${30}^o$ = ${60}^o$. And as angle of incident is equal to angle of reflection. So the angle of reflection will be ${60}^o$.