Question

Arrange the following steps of an experiment to determine the focal length of a concave mirror in proper order.
(A) Focus the mirror to a distant object.
(B) Place the concave mirror on a V shaped stand.
(C) Measure the distance between the screen and the mirror.
(D) Adjust the position of the screen, such that a clear image is formed on it.

• A. BCAD
• B. CDBA
• C. BADC
• D. BDAC

Answer 1

The correct option is C

BADC

Aim of the experiment:
To find the focal length of a concave mirror.

Material required;
Concave mirror, an object, V-shaped stand, scale, screen, etc.

Procedure:

1. Place the concave mirror on a V-shaped stand.
2. Focus the mirror on a distant object. Light rays coming from a distant object can be considered parallel rays.
3. Adjust the screen so that a clear image of the object is formed on it. A sharp image of the object will be formed at the focal length of the mirror on the screen
4. Measure the distance between the screen and the mirror. This distance is the focal length of the concave mirror.

Conclusion:
From the above procedure, we can see that the correct order of steps is BADC.

Hence, option (C) is the correct answer.