To find the focal length of a concave mirror, Sita should choose which one of the following set-ups?; A. A mirror holder and a screen holder; B. A screen holder and a scale; C. A mirror holder, a screen holder and a scale; D. A screen, a mirror, holders for them and a scale(All India - 2011)
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In order to find focal length option D is correct as she needs a mirror for forming image , screen to obtain image ,holders to hold and scale to find distance between screen and object.
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Answer:(d) A screen, a mirror, holders for them, and a scale.
Explanation:
To find the focal length of a concave mirror, Sita should choose a screen, a mirror, a holder for them, and a scale. The screen is used to obtain the real image, and a scale is used to measure the focal length.
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