Physics

 

Summary

 

·         Light is a transverse, electromagnetic wave that can be seen by the typical human.

 

 

o    The wave nature of light was first illustrated through experiments on diffraction and interference.

 

 

o    Like all electromagnetic waves, light can travel through a vacuum.

 

 

o    The transverse nature of light can be demonstrated through polarization.

 

 

o    Light is sometimes also known as visible light to contrast it from "ultraviolet light" and "infrared light".

 

 

o    Other forms of electromagnetic radiation that are not visible to humans are sometimes also known informally as "light"

 

 

More about Light

 

How big is a nm (nanometer)? It is one billionth of a meter! (1 x 10-9 )

What happens when light strikes an object?

 

• absorbed: transferred to the object (mainly as heat)

• reflected: it bounces off (such as with a mirror)

• transmitted: goes through (such as with glass)

 

 

 

Light & Objects

  

Objects are classified by what they do to light:

 

• opaque: Does not allow light to pass through. All light is either absorbed or reflected.

 

• translucent: Can be seen through, but not clearly. Allows some light to go through, but some is also absorbed or reflected. (such as waxed paper)

 

• transparent: Allows almost all light to go through, so can be seen through clearly. (such as window glass)

 

 

 

 

ASSIGNMENT  (10mks)(submit before Fri. 15^th May, 20)

1-Find out others sources of light

 

2.Find out other examples of opaque, transparent and translucent.

 

 

3- Perform an experiment to show that light travels in a straight line.

 

 

 

 

Name of Teacher: Miss Enemchukwu Chinelo

Submit your assignment to the teacher`s email. This email address is being protected from spambots. You need JavaScript enabled to view it. 

 

For further inquiry call her on: 08037522121

 

 

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