Question

Boojho found a bag containing the following materials: 2

1. Mirror

2. Paper stained with oil

3. Magnet

4. Glass spectacles

Help Boojho in finding out the material(s) which is/are opaque.

(a) Only (1)

(b) Only (4)

(c) (1) and (3)

(d) (1) and (4)​

Answer 1

Answer:

1 and 3 (hope it helps u)

Answer 2

Answer:

Correct option is: (c) (1) and (3)

Explanation:

• Opaque Material: The material through which light can not pass at all is called opaque material. Example - wood, wall etc.
• The mentioned materials in question are discussed below:

 1) Mirror: The front surface of mirror is made of glass, but behind the glass there is a carboard cover. As through cardboard light can not pass, so Mirror is an opaque material.

2) Paper stained with oil: When oil is polished over the paper, then it becomes a translucent material. Some of the light ray can pass through it. So this is not an opaque material.

3) Magnet:  Magnet is made of iron, nickel, cobalt etc. They all are opaque material. So magnet is opaque.

4) Glass spectacles: Through Glass spectacles we can see everything clearly. So this is a transparent material, not an opaque material.

• Conclusion: The opaque materials are mirror and magnet.

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