Boojho found a bag containing the following materials
(i) Mirror
(ii) Paper stained with oil
(iii) Magnet
(iv) Glass spectacles
Help Boojho in finding out the material(s) which is/are opaque.

Options

A. (i) only
B. (iv) only
C. (i) and (iii)
D. (ii) and (iv)

Explanation

To determine which materials are opaque from the list provided by Boojho, we can follow these steps:

### Step-by-Step Solution

1. **Understanding Opaque Materials**:
- Opaque materials are those through which light cannot pass. This means we cannot see through them at all.

2. **Analyzing Each Material**:
- **Mirror**: A mirror is made of glass with a reflective coating. It does not allow light to pass through; instead, it reflects light. Therefore, a mirror is an opaque material.
- **Paper stained with oil**: This paper may allow some light to pass through due to the oil, making it translucent. Thus, it is not opaque.
- **Magnet**: A magnet is a solid object that does not allow light to pass through. Therefore, a magnet is also an opaque material.
- **Glass spectacles**: Glass is a transparent material, meaning it allows light to pass through completely. Therefore, glass spectacles are not opaque.

3. **Conclusion**:
- The opaque materials found in the bag are the **mirror** and the **magnet**.

### Final Answer:
The materials that are opaque are:
- Mirror
- Magnet