If the absorption coefficient and reflection coefficient of a surface of a body are `0.4` and `0.6` respectively then:-

Options

A. Emissive power will be `0.2`
B. Transmission power will be `0.2`
C. Body will be be totally transparent
D. Body will be totally opaque.

Explanation

To solve the problem, we need to analyze the given coefficients: the absorption coefficient (A) and the reflection coefficient (R). The question provides us with the values:

- Absorption coefficient (A) = 0.4
- Reflection coefficient (R) = 0.6

We need to find the transmissive power (T) and determine the nature of the body (whether it is opaque or not).

### Step-by-Step Solution

1. **Understand the relationship between absorption, reflection, and transmission:**
The sum of the absorption coefficient (A), reflection coefficient (R), and transmissive coefficient (T) for a surface must equal 1. This can be expressed mathematically as:
\[ A + R + T = 1 \]

2. **Substitute the known values into the equation:**
We know:
- A = 0.4
- R = 0.6
Therefore, substituting these values into the equation gives:
\[ 0.4 + 0.6 + T = 1 \]

3. **Simplify the equation:**
Combine the known coefficients:
\[ 1 + T = 1 \]

4. **Solve for the transmissive power (T):**
To find T, we can rearrange the equation:
\[ T = 1 - 1 = 0 \]

5. **Interpret the result:**
Since the transmissive power (T) is 0, this indicates that the body does not allow any light to pass through it. Therefore, the body is completely opaque.

### Conclusion:
The body is totally opaque because it does not transmit any light.