53. An object is placed in front of a concave mirror and
it produces a real image of magnification 1.5. If the
object distance is decreased by 5 cm, the magnifi-
cation of the real image is increased to 4. Find the
focal length of the concave mirror.
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The answer should be 10.5 because my grandfather is a master at physics and chemistry so he knew it and the answer is correct, please give me thx
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