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The image of a microchip in a projection microscope measures 8 inches by 10 inches. The width of the actual chip is 4 millimeters. How long is the chip?

Answer 1

#5 mm.#

The image of a projection microscope keeps the original ratio: #k="width"/"length"#

As the width is assumed smaller than the length we have: #k=w/l=w_0/l_o"# #k=(8 cancel("in."))/(10 cancel("in."))=(4mm.)/l_o# #k=4/5=(4mm.)/l_o# => #l_o=5/cancel(4)*cancel(4)mm.# => #l_o=5mm.#

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Answer 2

James Atkins

The length of the chip is 5 millimeters.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.