Question

Boojho found a bag containing the following materials. Help Boojho in finding out the material(s) which is/are opaque.

• A. Mirror.
• B. Paper stained with oil.
• C. Magnet.
• D. Glass spectacles.

Answer 1

Answer: (A), (C)

Magnet.

The explanation for the correct options

The objects, which cannot see through, are known as opaque objects. In a word, opaque objects are not transparent.

For option A.

1. A mirror is a glass surface, which is coated with a metal amalgam to reflect a clear image.
2. As a mirror is covered with a metal amalgam, thus the mirror is not a transparent object.
3. Therefore, the mirror is an opaque object.

For option C.

1. A magnet is a piece of iron or other material which has its component atoms so ordered that the material attracts other iron-containing objectives or aligns itself in an external magnetic field.
2. As a magnet is a metal, that either reflects the light or absorbs the light but does not allow the light to pass through it. Thus the magnet is not a transparent object.
3. Therefore, the magnet is an opaque object.

The explanation for the incorrect option

For option B.

1. As the light can travel through a paper strained with oil, thus it is a transparent object.
2. Therefore, a paper strained with oil is not an opaque object.

For option D.

1. As the light can travel through a glass spectacle, thus it is a transparent object.
2. Therefore, a glass spectacle is not an opaque object.

Hence, option (A) and (C) is the correct options.