Question

can you determine the focal length of concave mirror if u<f​

Answer 1

Answer:

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Explanation:

Yes. You just need to know v. For those who don't know the symbols: f is the focal length, u is the distance from subject to centre of the (thin) lens, and v is the distance of the image. Clearly if u < f, then v will be negative (a virtual image). A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it.