What is the role of a plane mirror and a glass sheet in a solar cooker?

Explanation

### Step-by-Step Solution:

1. **Understanding the Solar Cooker**:
- A solar cooker is a device that utilizes sunlight to cook food. It operates without the need for electricity, making it an eco-friendly cooking method.

2. **Role of the Plane Mirror**:
- The plane mirror in a solar cooker is used to reflect and focus sunlight onto a specific point inside the cooker.
- This focusing of sunlight increases the intensity of the solar energy at that point, leading to a rise in temperature within the cooker.
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