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Revision Notes

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.

41 questions68 flashcards5 concepts

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Key Topics to Revise

1

1. Sources of Light

  • The Sun is the main source of natural light on Earth.
  • The Sun emits its own light, so it is a luminous object.
  • Stars, lightning, natural fire, and certain animals also emit their own light.
2

2. Does Light Travel in a Straight Line?

  • Observations from the matchbox activity suggest that light travels in a straight line.
  • The candle-flame-through-pipe activity also shows that light travels in a straight line.
  • A candle flame can be seen through a straight pipe, but not through a bent pipe.
3

3. Transparent, Translucent, and Opaque Materials

  • Light passes almost completely through transparent materials.
  • Light passes partially through translucent materials.
  • Light does not pass at all through opaque materials.
4

4. Shadow Formation

  • A shadow is a dark patch formed where light does not reach because an opaque object blocks it.
  • To observe a shadow, three things are needed: a light source, an opaque object, and a screen.
  • Walls, floors, and the ground can act as screens.

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Full Notes

Key Concepts

Objects that emit their own lightLight follows a straight pathTransparent materials let light pass throughA shadow is a dark patchWhen light strikes a mirror

Frequently Asked Questions

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?
Understand the core concepts first, then work through the 41 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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