Question

Saurabh has to perform the experiment of finding the focal length of a concave mirror by using a distant object. Which of the following ‘set ups’ will he choose apart from the mirror and screen
provided ?
(a) A mirror holder, and a scale
(b) A mirror holder, a screen holder and a scale
(c) A screen holder and a scale
(d) A mirror holder and a screen holder

Answer 1

Answer:

(b) A mirror holder, a screen holder and a scale

Answer 2

Apart from the mirror and screen provided Saurabh needs a mirror holder, screen holder and scale.

• To place the mirror in it, a mirror holder is needed, and a screen holder to hold the screen. To get a clear image of the distant object the screen must be moved, and then at that point a scale is needed to measure the distance between the mirror and screen.
• The experiment needs to be repeated 2-3 times and the readings are to be recorded to find the average of all the readings. The final answer will be the focal length.