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Q.

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 distances should he measure to get the focal length of the mirror?

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a

MW

b

MS

c

SW

d

MW - MS

answer is B.

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Detailed Solution

MS

distances should he measure to get the focal length of the mirror
When an object is between the centre of curvature and the focus of a concave mirror, the position of the image is outside the centre of curvature. When an object is in focus in a concave mirror, the image is at infinity. As a result, the concave mirror concentrates an image of a faraway object. The distance of the object is represented by the diagram, and the distance of the reflection by

MS,

which is the same as the mirror's focal length. The learner must make an educated guess regarding

MS

to evaluate the mirror's focal length.

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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 distances should he measure to get the focal length of the mirror?