Online worksheet ยท 3 of 4
An opaque object blocks light - Online practice 3
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Invented small-source shadow record: source and screen stay fixed 60 cm apart; the same opaque card keeps the same orientation. Source-to-card distance 15 cm gives shadow width 24 cm; distance 30 cm gives width 12 cm. Values are a simplified model, not guaranteed measurements. Use the record, not a Sun or laser experiment.
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