For an opaque surface, the absorptivity (α), transmissivity

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For an opaque surface, the absorptivity (α), transmissivity (τ) and reflectivity ρ are related by the equation

1. α + ρ = τ
2. ρ + α + τ = 0
3. α + ρ = 1
4. α + ρ = 0

Correct Option: C

α + τ + ρ = 1
for opaque surface, τ = 0
∴ α + ρ = 1