Question

Forty percent of the radiation incident upon a body are absorbed and 35% are transmitted. Then, its coefficient of reflection will be

• A. 0.35
• B. 0.25
• C. 0.4
• D. 1

Answer 1

The correct option is B 0.25

Coefficient of absorption$=\alpha$

Coefficient of transmission$=\beta$

Coefficient of reflection$=\gamma$

Total incident light will be splitted in transmission, reflection $4$ absorption.

So, sum of coefficients$=1$

$\alpha +\beta +\gamma =1$

$-.4+0.35+\gamma =1$ $\left\{\begin{array}{cc}\alpha =0.40& \left(given\right)\\ \beta =0.35& \end{array}\right\}$

$\therefore \gamma =0.25$.