Salmon has to perform the experiment of finding the focal length of a given concave mirror by using a distant object.

Monjur Alahi

Salmon has to perform the experiment of finding the focal length of a given concave mirror by using a distant object. Which of the following ‘setups’ will he choose apart from the mirror and screen provided ? 

A) a mirror holder, and a scale 

B) a mirror holder, a screen holder and a scale 

C) a screen holder and a scale 

D) a mirror holder and a screen holder


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Salim Ahmed Kawsar

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B) a mirror holder, a screen holder and a scale

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