A student has to determine the focal length of a given concave mirror by focusing a distant
object. Answer the following questions
(i) Which two precautions should he observe while selecting the object?
(ii) Which distance should he measure to determine the focal length and why?
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Answer:
(i) ->The measurements should be taken accurately with a ruler having no errors.
->The image should not be blurry. It should be a spot of light.
(ii)The distance between the mirror and the screen where the image is produced.
Explanation:
The experiment must be done by taking light from infinity. That is, you must consider a far away object such as rays from the sun.
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