Answer:
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Answer:
In Celsius:
Explanation:
The formula we are going to use is:
Where:
ε is the emissivity
σ is the Stefan constant
is the final temperature of surrounding surfaces
is the required temperature
is the are of surrounding surface
Calculating The area:
σ= 
ε =0.95
=55+273
=328 K
=100 W
In Celsius:
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Hope this helped!! :)
From Snell's Law;
n₁sinθ₁ =n₂sinθ₂
Therefore; since the ray is travelling from ethanol to air, then n1 = 1.36 and
θ1 = 34, while n2= 1.00
(1.36) sin 34 = (1.00) sin θ₂
sin θ₂ = 0.7605
θ₂ = 49.50
≈ 49 °
The angle of refraction is therefore 49 degrees
