Wednesday, December 23, 2009

Is light rays real ??

In physics we use the idea of a light ray to indicate the direction that light travels. Light rays are lines with arrows and are used to show the path that light travels.

The most important thing to remember is that we can only see an object when light from the object enters our eyes. The object must be a source of light (for example sun) or else it must reflect light from a source (for example the moon), and the reflected light enters our eyes.

Light rays are straight lines with arrows to show the path of light.
Important: Light rays are not real. They are merely used to show the path that light travels.

Did you still remember, light travel in straight line?

Formation of shadows is the evidence that light
travel in straight line.

Test Quiz

1. Are light ray real ? Explain.
2. Give evidence to support the statement:" Light travels in straight lines". Draw a ray diagram to prove this.


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