LIGHT
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What is light and how does it travel?
Light is a form of energy that travels in waves. Unlike sound, it can travel through a vacuum and does not require a medium. It travels in straight lines from its source.
What is the speed of light in a vacuum?
Approximately 300,000,00 m/s. Nothing travels faster than light
What is the difference between luminous and non-luminous objects? Provide examples.
Luminous: Objects that produce their own light (stars, light-bulbs, phones) Non-Luminous: Objects that do not produce light (the moon, tables, trees)
Defibe the 3 types of light transmission: Transparent, Translucent and Opaque
-Transparent: Aloows light to pass through -Translucent: Some light passes throughbut is scattered or bent -Opaque: No light is transmitted; it is either absorbed or reflected
What is the Law of Reflection?
When light bounces off a material, the angle at which the incoming ray (incident ray) hits exactly equal to the angle at which the bounced ray (reflected ray) leaves
What is refraction
Refraction is the bending of light as it passes from one matieral into another
How does refraction occur?
Refraction happens because light changes speed when it travels from one material into another
How does material density affect refraction?
Less dense —> More dense: Light bends towards the normal line More dense —> Less dense: Light bends away from the normal line