Light: Shadows and Reflections
CBSE · Class 7 · Science
Quick revision notes for Light: Shadows and Reflections — CBSE Class 7 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Sources of Light
- The Sun is the main source of natural light on Earth
- Natural sources: Sun, stars, lightning, fire, fireflies, and other luminous animals
- Artificial sources: candles, oil lamps, electric bulbs, LED lights, tube lights
Light Travels in Straight Lines
- Light travels in straight lines - this is called rectilinear propagation of light
- We can see objects only when light from them reaches our eyes in straight lines
- Three holes in matchboxes must be aligned to see light pass through
Light and Materials
- Transparent materials allow light to pass almost completely (clear glass, water)
- Translucent materials allow light to pass partially (frosted glass, tracing paper)
- Opaque materials do not allow light to pass through (wood, metals, cardboard)
Shadow Formation
- Shadows form when opaque objects block light from reaching a surface
- Three things needed for shadow: light source, opaque object, and screen
- Shadow size depends on the distance between object, light source, and screen
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What are the important topics in Light: Shadows and Reflections for CBSE Class 7 Science?
Light: Shadows and Reflections covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Light: Shadows and Reflections — CBSE Class 7 Science?
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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