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 understand the relationship between the absorption coefficient (A), reflection coefficient (R), and transmission coefficient (T) of a surface. The key equation that relates these coefficients is:

\[ A + R + T = 1 \]

Where:
- \( A \) is the absorption coefficient
- \( R \) is the reflection coefficient
- \( T \) is the transmission coefficient

Given:
- Absorption coefficient \( A = 0.4 \)
- Reflection coefficient \( R = 0.6 \)

We need to find the transmission coefficient \( T \).

### Step-by-step Solution:

1. **Write down the equation**:
\[ A + R + T = 1 \]

2. **Substitute the known values**:
\[ 0.4 + 0.6 + T = 1 \]

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

4. **Isolate \( T \)**:
\[ T = 1 - 1 \]
\[ T = 0 \]

5. **Interpret the result**:
Since the transmission coefficient \( T = 0 \), this means that no light is transmitted through the body. Therefore, the body is completely opaque.

### Conclusion:
The body will be totally opaque.