Science Class 7
Light: Shadows and Reflections
Light goes in straight lines. That makes shadows, pinhole pictures and mirror images.
14 lessons · ~72 min total
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Lessons in this topic
- 0 Start here Light goes straight. That gives shadows, a pinhole picture, and a mirror image. · 3 min You are here
- 1 Light travels in straight lines Light leaves a lamp and goes straight until something blocks it. · 5 min
- 2 A shadow is a place light did not reach A shadow needs a light, an opaque object, and a surface behind it. · 5 min
- 3 How big, and what shape Nearer the lamp, the shadow grows. Turn the object, and the outline changes. · 6 min
- 4 A hole makes a picture A tiny hole paints the scene outside on the back of a box, upside down. · 6 min
- 5 Light bounces off a smooth surface Light leaves a smooth surface at the same slant it arrived at. · 5 min
- 6 What you see in a mirror Your image is the same size, the same way up, and left-right swapped. · 6 min
- 7 Why a wall shows you nothing A rough surface tilts every tiny patch its own way, so no picture survives. · 6 min
- 8 Checkpoint: straight lines, shadows and mirrors A quick check on straight rays, shadows, pinholes and mirrors. · 4 min
- 9 Does it make its own light? A luminous object makes its own light. A non-luminous one does not. · 5 min
- 10 How much light gets through? Transparent, translucent and opaque materials pass different amounts of light. · 5 min
- 11 A simple periscope uses two mirrors Two mirrors at 45° turn light twice. You see over a wall. · 5 min
- 12 The big picture Ten ideas about light. All grow from one habit. · 4 min
- 13 Track quiz A cheat-sheet of the ten rules, then thirteen questions on light. · 7 min
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