3 The image of a speck of dust viewed through an electron microscope is 1 2 x 10 millimetres wide The image is 5 x 102 times as

Question

3 The image of a speck of dust viewed through an electron microscope is 1 2 x 10 millimetres wide The image is 5 x 102 times as large as the actual size Determine the width in millimetres of the actual speck of dust

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