Class 7 Science — Chapter 11: Light: Shadows and Reflections

What you'll learn

• ▸Luminous and Non-Luminous Objects
• ▸Sources of Light
• ▸Rectilinear Propagation of Light
• ▸Transparent, Translucent, and Opaque Materials
• ▸Shadow Formation
• ▸Characteristics of a Shadow
• ▸Reflection of Light

Chapter Summary

--- PAGE 1 --- 11 Light: Shadows and Reflections In the Western Ghat region of Maharashtra, Keshav spends part of his summer vacation at his friend Jatin's grandparents' village. Having lived in a big city, he finds the forests, fresh air, sounds of gushing streams, and chirping birds a novel experience. However, for Keshav, the most fascinating sight is the dance of hundreds of fireflies at night, flashing their lights in a wonderful performance. Jatin's grandparents explain that fireflies are seasonal insects and they use light to communicate. Unfortunately, Keshav also learns the number of fireflies is decreasing due to light pollution, reduced forest cover, and excessive tourism. 0777CH11 At the end of their vacation, Keshav and Jatin board an evening bus back to their city. As the bus winds through the hilly roads, Keshav watches the moonlit landscape and the beams from the headlights of passing vehicles flashing by. He is reminded of the many poems and songs about moonlight, …

Practice Questions from this Chapter

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1. Bend light around a corner? Get Solution →
2. Name five new luminous objects. Get Solution →
3. Show an example of translucent material. Get Solution →
4. What is an object that emits its own light called? Get Solution →
5. According to the text, which of these is an example of a non-luminous object? Get Solution →
6. What is described as the main source of natural light on Earth? Get Solution →
7. The activities with the matchboxes and the bent pipe demonstrate that light travels in what way? Get Solution →
8. What type of material does not allow light to pass through it at all? Get Solution →

Did you know?

• 💡 Fireflies produce light through a chemical reaction in their bodies.
• 💡 Light travels so fast that it can go around the Earth seven times in one second.
• 💡 The Sun's light comes from nuclear fusion converting hydrogen into helium.
• 💡 Moonlight is about 400,000 times dimmer than direct sunlight.
• 💡 Before electricity, humans used oil lamps, candles, and gas lamps for light.

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