A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distance should he measure to get the focal length of the mirror ?

(a) MW
(b) MS
(c) SW
(d) MW - MS

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Solution

(b) MS

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A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distance should he measure to get the focal length of the mirror ? (a) MW (b) MS (c) SW (d) MW - MS

(b) MS

A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distance should he measure to get the focal length of the mirror ?

(a) MW
(b) MS
(c) SW
(d) MW - MS