Question

ANSWER TO GET 20 POINTS........
Saurabh has to perform the experiment of fi nding 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
GIVE SOME EXPLANATION TO GET FULL POINTS

Answer 1

Answer:

(b)

Explanation:

You need a mirror holder to place the mirror in it and a screen holder to hold the screen. You have to move the screen in order to get a clear image of the distant object. And then you need a scale to measure the distance between the mirror and screen at that point. Record the reading. Repeat the experiment 3-4 times and take readings and then find the average of all those readings. The final answer will be your focal length.