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To find the focal length of a concave mirror, Sita should choose which one of the following- A mirror holder and screen holder.
- A screen holder and a scale.
- A mirror holder, a screen holder and a scale.
- A screen, a mirror, holder for them and a scale.
(d) A screen, a mirror, holder for them and a scale.
Explanation
To find the focal length of a concave mirror, Sita should choose a screen, a mirror, holder for them and a scale, where the screen is used to collect the real image, and a scale to measure the focal length.
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