Light and Shadow (Class 5 CBSE): 20 flashcards
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1. How does light travel?
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Light travels in straight lines. This is called rectilinear propagation of light.
2. What is a shadow?
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A shadow is a dark area formed behind an opaque object when light is blocked by it.
3. What three things are needed to form a shadow?
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A light source, an opaque object, and a screen (or surface) where the shadow falls.
4. What happens to light when it hits a transparent material?
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Light passes through completely, so no shadow is formed. Examples: clear glass, air, water.
5. What happens to light when it hits a translucent material?
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Light passes through partially, so a faint shadow is formed. Examples: butter paper, frosted glass.
6. What happens to light when it hits an opaque material?
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Light does not pass through at all, so a dark, clear shadow is formed. Examples: wood, metal, your body.
7. On which side of an object does a shadow form?
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A shadow always forms on the opposite side of the object from the light source.
8. What happens to shadow size when the object moves closer to the light source?
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The shadow becomes larger.
9. What happens to shadow size when the object moves farther from the light source?
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The shadow becomes smaller.
10. What happens to a shadow when the object moves closer to the screen?
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The shadow becomes sharper and smaller.
11. What happens to a shadow when the object moves farther from the screen?
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The shadow becomes larger and blurrier.
12. Why is your shadow longer in the morning and evening?
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Because the Sun is low in the sky, so light hits you at a slant, making the shadow long.
13. Why is your shadow shorter at noon?
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Because the Sun is almost directly overhead, so light hits you from above, making the shadow short.
14. What is the difference between a shadow and a reflection?
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A shadow is a dark area behind an opaque object with no details. A reflection is light bouncing off a shiny surface, showing details and colour.
15. What is a pinhole camera and what does it prove?
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A pinhole camera is a closed box with a tiny hole that forms an inverted image on a screen. It proves that light travels in straight lines.
16. What is a solar eclipse?
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A solar eclipse happens when the Moon blocks sunlight and casts a shadow on Earth.
17. Are shadows always black?
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No. Shadows can be grey or faint depending on the material. Translucent objects make faint shadows, not dark ones.
18. What is rectilinear propagation of light?
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The property of light travelling in straight lines in a given medium.
19. Give two real-life uses of shadows.
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Shadow puppets for storytelling, and using your shadow's length as a rough clock through the day.
20. Why does a transparent object form no shadow?
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Because light passes through it completely without being blocked.
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