Question

A student focused the image of a candle flame on a white screen by placing the flame at varius
distances from a concave mirror. He noted his observations:
Distance of flame from the mirror
(cm)
Distance of screen from the mirror
(cm)
40 40
60 30
20 25
30 60
a) From the above table find the focal length of the mirror without using mirror formula.
b) Which set of observation is incorrect and why?
c) In which case will the size of image will be same. Give reason for your answer.

Answer 1

Answer:

im also in 10th class in kendriya vidyalaya , indore