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Chapter overview
Study Light Energy through notes, flashcards, revision, MCQs, and long-answer practice.
Practice ready
9580 MCQs and 4344 written prompts are ready for focused chapter work.
Topics
4
Recall
12
Cards
24
Topic 1
Incident ray, reflected ray, and normal are used to describe reflection.
Topic 2
The image in a plane mirror appears behind the mirror at the same distance as the object is in front.
Topic 3
The speed of light is about 300,000,000 metres per second in vacuum.
Topic 4
Colour addition mixes coloured light; colour subtraction happens when materials absorb some colours.
Chapter pack
Topic list
Topic 1
Reflection is the bouncing back of light from a surface. The angle of incidence equals the angle of reflection.
Topic 2
A plane mirror forms a virtual, erect image of the same size as the object, with lateral inversion.
Topic 3
Light travels extremely fast. In vacuum, its speed is approximately 3 x 10⁸ m/s.
Topic 4
Red, green, and blue are primary colours of light. Colours seen by objects depend on reflected and absorbed light.
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