A ray of light is incident at an angle of `35^@` on a plane mirror. What is the angle between the incident and the reflected rays ?

Options

A. `90^@`
B. `100^@`
C. `110^@`
D. none of these

Answer

To solve the problem of finding the angle between the incident and reflected rays when a ray of light is incident at an angle of \(35^\circ\) on a plane mirror, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Information:**
- The angle of incidence (\(I\)) is given as \(35^\circ\).

2. **Understand the Law of Reflection:**
- According to the law of reflection, the angle of incidence is equal to the angle of reflection. This means:
\[ I = R \]
where \(I\) is the angle of incidence and \(R\) is the angle of reflection.

3. **Calculate the Angle of Reflection:**
- Since the angle of incidence is \(35^\circ\), the angle of reflection will also be:
\[ R = 35^\circ \]

4. **Determine the Angle Between the Incident and Reflected Rays:**
- The angle between the incident ray and the reflected ray can be found by adding the angle of incidence and the angle of reflection:
\[ \text{Angle between incident and reflected rays} = I + R \]
- Substituting the values we have:
\[ \text{Angle} = 35^\circ + 35^\circ = 70^\circ \]

5. **Final Result:**
- The angle between the incident and reflected rays is \(70^\circ\).

### Summary:
The angle between the incident and reflected rays is \(70^\circ\).