The coefficient of reflection of an athermanous substance that has the coefficient of absorption as 0.65 is 0.35.

The coefficient of absorption+coefficient of reflection=1

then, 0.65+coefficient of reflection=1

hence, coefficient of reflection=0.35

Do you know what is the coefficient of reflection of an athermanous substance that has the coefficient of absorption as 0.65?

The coefficient of reflection of an athermanous substance that has the coefficient of absorption as 0.65 is 0.35.

The coefficient of absorption+coefficient of reflection=1

then, 0.65+coefficient of reflection=1

hence, coefficient of reflection=0.35