Tuesday, 21 September 2021 09:09

Energy - Class 6 Science Revision Notes

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Light

How light travels

  • Light travels in a straight line away from the source.
  • Light travels to all directions from the source.

Transparent Materials

They are materials that allow all light to pass through them and one can see through them clearly.
Examples: Clear glass, Clear water, air

Uses of transparent materials

  • They are used in making:
  • Car windscreens
  • Spectacles
  • Window panes
  • Lamps
  • Glass walls

Translucent Materials

They are materials that allow only little light to pass through them.
Examples:

  • Frosted glass
  • Tracing paper
  • Oiled or waxed paper

Uses of translucent materials

They are used in making:

  • Skylights
  • Toilet and bathroom window panes
  • Ambulance windows.

Opaque Materials

They are materials that do not allow any light to pass through them.
When light hits an opaque materials a shadow is formed.
Examples:

  • Wood
  • Stone
  • Metals


Reflection of Light

Reflection is the bouncing back of light when Materials that reflect light are called reflectors.
Reflection happens when light hits a smooth shinny surface.

Types of Reflection

  • Regular reflection
  • Irregular (diffused)

Characteristics of the image in a plane mirror

  • The image is upright
  • The image is behind the mirror
  • The image is the same size as the object
  • The image is laterally inverted.


Refraction of Light

It is the process in which light bends or changes direction when it moves from one medium to another. (air to water)

Effects of Refraction                                       

  • Objects appear bent or broken
  • Objects appear bigger
  • Swimming pool appear shallower

Making a Rainbow

A rainbow is formed by the refraction of light. To be formed raindrops and sunshine is required.
The process of splitting light into seven different colours is known as dispersion.
A group of seven colours in the rainbow is known as spectrum


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