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A concave mirror has radius of curvature 40cm. An object is placed at a distance of 25cm. What is the position of image?
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Radius 40cm is just a (contrived) way of saying the focal length is 20cm, and an object placed at the focus does not produce an image — all the relevant rays are parallel and do not meet.
Some might say the image is formed “at infinity”, though whether that is plus infinity or minus infinity is debatable, as is whether the image is real or virtual.
It’s a “division by zero” situation where sensible maths no longer applies.
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