Science: 5 Light

Year 7 Science –: Light (Short Answers)1. How does light travel?In straight lines.2. How fast is light?Very fast — faster than sound.3. Where does light come from?From a light source like the sun, torch, or bulb.4. What do ray diagrams show?They show the direction light travels using arrows.5. How are shadows formed?When light is blocked by an object.6. What are opaque materials?They don’t let any light through (e.g. wood, metal).7. What are translucent materials?They let some light through, but not clearly (e.g. frosted glass).8. What are transparent materials?They let all the light through — you can see through them (e.g. clear glass).9. How do we see non-luminous objects?They reflect light into our eyes.10. How does reflected light travel?Still in straight lines.11. What does a mirror image look like?It’s upright, same size, and appears behind the mirror — this is a virtual image.12. What is refraction?When light bends as it moves between materials (like air to water).13. Why does light bend during refraction?Because it changes speed in different materials.14. What is white light made of?A spectrum of colours (red to violet).15. What are the colours of the spectrum?Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).16. Which colours bend the most and least?Red bends leastViolet bends most17. What happens when red, green, and blue light mix?They make white light.18. Why does an object look red?It reflects red light and absorbs the other colours.19. What do white and black objects do with light?White reflects all colours.Black absorbs all colours.20. What do coloured filters do?They block some colours and let others through.21. Can coloured objects look different under coloured light?Yes — a red object under blue light might look black because it can’t reflect blue.22. What should ray diagrams for reflection show?A light ray hitting a surface, bouncing off, and showing angle of incidence = angle of reflection.