To find the focal length of a concave mirror, Sita should choose which one of the following

1. A mirror holder and screen holder.
2. A screen holder and a scale.
3. A mirror holder, a screen holder and a scale.
4. 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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Updated on: 10-Oct-2022

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