The angle of incidence on a plane mirror is `30^@`. The angle of reflection will be:

Options

A. `30^@`
B. `60^@`
C. `15^@`
D. `0^@`

Answer

To solve the problem, we will apply the law of reflection, which states that the angle of incidence is equal to the angle of reflection.

### Step-by-Step Solution:

1. **Identify the Given Information**:
- The angle of incidence (I) on the plane mirror is given as \(30^\circ\).

2. **Recall the Law of Reflection**:
- According to the law of reflection, the angle of incidence is equal to the angle of reflection. Mathematically, this can be expressed as:
\[ \text{Angle of Incidence (I)} = \text{Angle of Reflection (R)} \]

3. **Apply the Law of Reflection**:
- Since we know the angle of incidence is \(30^\circ\), we can substitute this value into the equation:
\[ I = R \implies 30^\circ = R \]

4. **Conclusion**:
- Therefore, the angle of reflection (R) is also \(30^\circ\).

### Final Answer:
The angle of reflection will be \(30^\circ\).

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