. Find the smallest number by which 10368 be divided, so that the result is a perfect square. Also, find the square root of the resulting number.
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In square roots 1 to 100, the numbers 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100 are perfect squares and the remaining numbers are non-perfect squares i.e. their square root will be irrational.Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=50cm.
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