Question

Observe the picture given in figure carefully. A patch of light is obtained at B, when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light? (b) A glass sheet (c) A mirror (d) A sheet of white paper,

Source of light

• A. A glass sheet
• B. A mirror
• C. A sheet of white paper
• D. None of these

Answer 1

The correct option is B

A mirror

Explanation for the correct option

Option (B)

1. From the figure light rays change their direction after touching object A, i.e, light rays deviate from A. Such deviation of light rays is called reflection.
2. Reflection happens when a smooth, clean obstacle is placed in the direction of light rays.
3. From the figure it is clear that A is a reflective surface.
4. A mirror is a fine element for reflection. It can reflect 99 % of incident rays.
5. A is a mirror, which reflects the light rays coming from the torch.

Diagram

Explanation for the incorrect options

Option (A)

1. A glass sheet is a transparent element, by which refraction can occur but not reflection. So option (A) is incorrect.

Option (C)

1. A sheet of white paper is a non-reflecting element. So, using a sheet of white paper light does not reflect. So option (C) is incorrect.

Therefore, option (B) is the correct option.