question_answer

If the angle of deviation after reflection of a light ray is d, then find (a) Angle of incidence (b) Angle of reflection   (c) Angle of glancing

Answer:

Angle of deviation \[=d;\text{ }i=?;\text{ }r=?;\text{ }g=?\] We know that,\[d=180-2i\Rightarrow 2i-180-d\] or \[i=\frac{180-d}{2}\] Angle of reflection, \[r=i=\frac{180-d}{2}\] We know that, glancing angle, \[g=90-i\] \[\Rightarrow \]\[g=90-\frac{180-d}{2}=\frac{d}{2}\]