Question

Coefficient of reflection coefficient of absorption and coefficient of transmission are related as

Answer 1

Answer:

The reflection coefficient is the reverse of the transmission coefficient.

Answer 2

Answer:

The ability of a body or material to absorb, reflect, or transmit radiation is measured, respectively, by the coefficients of absorption(a), reflection(r), and transmission(t).

$a+r+t=1$

Explanation:

1. The ratio of the amount of radiant energy absorbed by the body to the amount of radiant energy incident on the body at the same moment is known as the coefficient of absorption, absorptive power, or absorptivity of a body.

2. The amount of radiant energy reflected by a surface to the amount of radiant energy incident on the surface at the same moment is known as the coefficient of reflection, reflectance, or reflecting power of a body's surface.

3. The ratio of the amount of radiant energy transmitted by a body to the amount of radiant energy incident on the body at the same moment is known as a body's coefficient of transmission, transmittance, or transmissive power.

Let $Q_{a} ,Q_{r}$ and $Q_{t}$ be the amounts of radiant energy that the body simultaneously absorbs, reflects, and transmits, respectively, and let Q be the amount of radiant energy that is incident on the body. Due to the conservation of energy, we have,

$Q_{a} +Q_{r} +Q_{t} =Q\\\frac{Q_{a} }{Q} +\frac{Q_{r} }{Q} +\frac{Q_{t} }{Q} =1$

a=(coefficient of absorption),r=(coefficient of reflection) and t=(coefficient of transmission)

Therefore, $a+r+t=1$

The necessary relation is this one.

Note:

They have no units and are dimensionless quantities. They are influenced by the body's composition and physical state, as well as the frequency of incident radiation.

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