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F4 Chap 5 KKS Notes

Light is a form of energy that travels as an electromagnetic wave and can pass through solids, liquids, gases and vacuum. It travels fastest in vacuum. Light of different colors has the same speed in vacuum. Reflection of light occurs when light hits a surface. The incident ray hits the surface and the reflected ray bounces off. The angle of incidence is equal to the angle of reflection and both lie in the plane of the normal line perpendicular to the surface.

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45 views1 page

F4 Chap 5 KKS Notes

Light is a form of energy that travels as an electromagnetic wave and can pass through solids, liquids, gases and vacuum. It travels fastest in vacuum. Light of different colors has the same speed in vacuum. Reflection of light occurs when light hits a surface. The incident ray hits the surface and the reflected ray bounces off. The angle of incidence is equal to the angle of reflection and both lie in the plane of the normal line perpendicular to the surface.

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khangsiean89
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Form 4 Chapter 5 : Light

Light is a form of energy. It travels in the form of electromagnetic wave. In


can travel through solid, liquid, gas and vacuum. It travels fastest in the
medium of vacuum. Light of different colours travels at the same speed in
the medium of vacuum.

5.1 Reflection of light


Plane mirror and reflection: In the boxes provided for the diagram below,
write the name of each of the parts shown.

1. The light ray that strikes the surface of the mirror is called incident
ray.
2. The light ray that bounces off from the surface of the mirror is called
reflected ray.
3. The normal is a line perpendicular to the mirror surface where the
reflection occurs.
4. The angle between the incident ray and the normal is called the angle
of incidence, i.
5. The angle between the reflected ray and the normal is called the
angle of reflection, r.
The laws of reflection:
1. The incident ray, the reflected ray and the normal to the surface all lie
in the same plane.
2. The angle of incidence, i, is equal to the angle of reflection, r.

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