Class 7 Science — Chapter 11: Light: Shadows and Reflections
Chapter 11: Light: Shadows and Reflections is a chapter in Class 7 Science (Curiosity), part of the CBSE NCERT curriculum followed by over 25 million students across India. This chapter covers 7 topics including Luminous and Non-Luminous Objects, Sources of Light, Rectilinear Propagation of Light. BrainWeave provides free AI-powered explanations — by voice or text, in Hindi or English — with no signup required.
What you'll learn
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▸Luminous and Non-Luminous ObjectsCore conceptluminousnon-luminousemit lightreflect lightSunMoon
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▸Sources of Lightnatural sourcesartificial sourcesemitlightningLED
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▸Rectilinear Propagation of LightCore conceptstraight linerectilinear propagationpath of lightbeam of light
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▸Transparent, Translucent, and Opaque MaterialsCore concepttransparenttranslucentopaqueblock lightpass through
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▸Shadow FormationCore conceptshadowopaque objectlight sourcescreendark patch
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▸Characteristics of a ShadowCore conceptsize of shadowshape of shadowdistancepositioncolorless
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▸Reflection of LightCore conceptreflectionshiny surfacemirrorbouncing lightbright spot
Chapter Summary
Students should be able to differentiate between objects that emit their own light (luminous), such as the Sun, and those that are visible only because they reflect light from another source (non-luminous), such as the Moon.
Students should be able to identify and categorize various sources of light as either natural (like the Sun, stars, fireflies) or artificial (like fire, electric bulbs, LEDs).
Students must understand the fundamental principle that light travels in a straight line. This concept is demonstrated through activities involving viewing a light source through straight and bent pipes or aligned holes.
Students should learn to classify materials based on their interaction with light: transparent materials allow light to pass through completely, translucent materials allow partial passage, and opaque materials block light entirely.
Students should understand what a shadow is (a dark area formed when light is blocked) and identify the three essential components for its formation: a source of light, an opaque object, and a screen.
Students should understand how the size and shape of a shadow are influenced by the distance between the light source, the object, and the screen. They should also know that the color of the opaque object does not affect the color of its shadow.
Students should be introduced to the concept of reflection, which is the bouncing of light off a surface. They should understand that shiny or polished surfaces, like mirrors, are good reflectors.
Practice Questions from this Chapter
Tap "Get Solution" on any question to ask our AI tutor.
- Bend light around a corner? Get Solution →
- Name five new luminous objects. Get Solution →
- Show an example of translucent material. Get Solution →
- What is an object that emits its own light called? Get Solution →
- According to the text, which of these is an example of a non-luminous object? Get Solution →
- What is described as the main source of natural light on Earth? Get Solution →
- The activities with the matchboxes and the bent pipe demonstrate that light travels in what way? Get Solution →
- 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.
Frequently Asked Questions
How many topics are covered in this chapter?
This chapter covers 7 key topics: Luminous and Non-Luminous Objects, Sources of Light, Rectilinear Propagation of Light, Transparent, Translucent, and Opaque Materials, Shadow Formation, and more. The BrainWeave AI tutor explains each one with examples.
Is Chapter 11: Light: Shadows and Reflections important for board exams?
Class 7 is a foundation year. Mastering this chapter now will help you build strong fundamentals for the higher classes.
Can I get NCERT solutions for this chapter in Hindi?
Yes. BrainWeave's AI tutor supports Hindi, English, and Hinglish for both voice and text chat. Just ask your question in your preferred language.
Is BrainWeave free for Class 7?
Yes. BrainWeave's free Spark plan gives generous daily messages — enough for regular homework. Premium features unlock when you bring your own free Google Gemini API key.
Can I use voice chat for this chapter?
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