Q1
How does light travel?
AIn straight lines
BIn curves always
CRandomly
DIt doesn't travel
ICSEClass 7 (ICSE)ScienceCh 4 · Topic 1
Light Energy
Light energy travels in straight lines and can be reflected, refracted, or absorbed, enabling us to see and understand our surroundings.
Core concept
Light travels in straight lines called light rays, which is why shadows form when an object blocks light.
How it works
Reflection occurs when light bounces off a surface, like a mirror, following the law that the angle of incidence equals the angle of reflection.
Why it matters
Refraction occurs when light bends as it passes between different mediums, like from air to water, causing objects to appear shifted.
Key detail
Understanding light helps explain phenomena like shadows, rainbows, and how optical instruments like microscopes and telescopes work.
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Quick notes
• Light travels in straight lines (light rays).
• Shadows form when objects block light.
• Reflection is light bouncing off a surface.
• Angle of incidence equals angle of reflection.
• Refraction is light bending between mediums.
• This causes objects to appear shifted in water.
• Light explains shadows and rainbows.
• It explains microscopes and telescopes too.