Printable worksheet ยท 3 of 4
Use the same units before dividing - Paper 3
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
Read before answering
Calibrated image length 21 mm; actual object length 70 micrometres. Magnification=image size/actual size in matching units; 1 mm=1000 micrometres. A later copy doubles both image dimensions and its embedded scale bar. Assume the original measurements are correctly calibrated.
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- Calculate magnification from 21 mm and 70 micrometres.
- What is the magnification on the doubled-size copy? Does the actual object double in size?
- Why can an embedded scale bar stay useful when a printed magnification label becomes wrong? Does enlargement guarantee better resolution?
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