Question

If transmissivity is zero then -

$a$ is absorptive power and $r$ is reflective power.

• A. $a-r=1$
• B. $a+r=1$
• C. $a-r=0$
• D. $a+r=0$

Answer 1

The correct option is B $a+r=1$

If transmissivity is zero, the sum of reflective power and absorptive power will be one.

$\therefore a+r=1$

​​​​​​​Hence, option $\left(B\right)$ is the correct answer.