Q. A boy of height stands in front of a convex mirror. His distance from the mirror is equal to its focal length. The height of his image is

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A

B

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Solution:

Let be focal length of the convex mirror.
According to new cartesian sign convention
Object distance, , focal length
Using mirror formula,
or or
The image is formed at a distance behind the mirror. It is a virtual image.
Magnification,
Also,

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