Light Energy — Chapter Summary
ICSE · Class 7 · Physics
Summary of Light Energy for ICSE Class 7 Physics. Key concepts: The returning of light in, A plane mirror is made by and The incident ray is the ray.
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Overview
Light is a form of energy that makes vision possible. It travels in straight lines and can travel through vacuum. When light falls on a surface and returns into the same medium, reflection of light takes place. Reflection explains the working of mirrors, the formation of images, the speed of light i
Key Concepts
The returning of light in
The returning of light in the same medium after striking a surface is called reflection of light. A shiny surface like a mirror reflects light strongl
A plane mirror is made by
A plane mirror is made by silvering one side of a thin plane glass plate. The reflecting surface faces the incident light, and the silvered side is op
The incident ray is the ray
The incident ray is the ray that strikes the surface. The reflected ray is the ray that returns after striking the surface. The normal is the perpendi
The first law states that
The first law states that the angle of incidence is equal to the angle of reflection. The second law states that the incident ray, reflected ray, and
A plane mirror forms a virtual
A plane mirror forms a virtual, erect image behind the mirror. The image is the same size as the object and is as far behind the mirror as the object
Learning Objectives
- Explain reflection of light and related terms such as incident ray, reflected ray, normal, angle of incidence, and angle of reflection.
- State the laws of reflection and use them to describe the reflection of a light ray from a plane mirror.
- Describe the image formed by a plane mirror and its characteristics.
- Distinguish between real image and virtual image.
- Explain lateral inversion and its effect on letters and words.
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