4 years ago

What is the focal length of the mirror? follow the sign conventions?

1 answer:

4 0

Well, the focal length is a distance to the point in which all of the rays of a parallel beam cross. Since a parallel beam reflected by the mirror is still parallel and does not converge, no matter how far from the mirror it travels, the focal distance of a mirror is

f = -∞

minus sign denotes that the image in the mirror is imaginary

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