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  • Created by: Alaina
  • Created on: 03-05-13 21:14

Luminous and Non-Luminous sources

Luminous source of Light

An object which creates its own light.

eg. The Sun, a light-bulb, jellyfish, lavalamp a TV

Non-Luminous source of light

An object which is unable to create its own light.

eg. The Moon, stars, a pencilcase and a chair.

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Definitons of Transparent, Translucent and Opaque



Having the property of transmitting rays of light through its substance so that bodies situated beyond or behind it can be distinctly seen.



It means partly transparent or allowing light to pass through partially. Translucent is like thick glass or paper. It allows light through but it is NOT sse-through like transparent windows.



(adjective) not clear, not transmitting or reflecting light or radiant energy.

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Angles of Incidence and Reflection in Mirrors

Angles of Incidence and Reflection in Mirrors

There is a scientific law which says the Angle of Incidence and Reflection are always the same wize. These angles don't have to add up to 90 degrees to be correct, but some do. If the angles have a 2-3 degree difference. the law is still correct.

Looking into mirrors

  • Flipped
  • Same size
  • The virtual image is the same discrance apart

The object is as far away from the mirror as the virtual image is from the mirror. It is also laterally inverted.

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Light and Glass

When blocking light with glass, the position of it distorts.

The angles between are all a difference of only 5 degeees each. However, it is not always 5 degrees but more or less. This means the angle of Incidence is smaller than the angle of Reflection. 

This shows lines bend toward the normal when entering a less dense medium. This is due to the light slowing down as it enters the perspex and then speeding it up again when leavng it.

White light would be very fast until it hits the prism, which slows it down. Therefor splitting it up into the colours it is made of:


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What causes light to become translucent?

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