40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the absorptivity of surface is

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Q. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the absorptivity of surface is

(A) 0.45
(B) 0.55
(C) 0.40
(D) 0.75

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✅ Correct Answer: (A) 0.45

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