Unit 2 Optics

Chapter 4 Many properties of light can be understood using a wave model of light.

4.2 Properties of Visible Light

4.2 Introduction page 144

When light reflects off a prism, the prism refracts light which separates the colours. When a second prism is added, it can produce a white light by combining the colours. With this, we can conclude visible light is a mixture of many colours, or all the colours of the rainbow. These colours of light are carried by light waves which can have various wavelengths. When an object looks a certain colour, lets say blue, the object in the sunlight looks blue because of the sunlight reflecting blue apon it and absorbing other colours other than blue from the sunlight. Rainbows are considered huge curving arcs with bands of colour. They appear after rainstorms showing a bright display of colour through the sky.

Questions
Answers
What is visible light?
Visible light is a mixture of many colours, or all the colours of the rainbow.


If a prism refracts light, is the prism seperating the colors?
Yes, the prism will be seperating colours.


If an object is red, is it because it reflects red, and absorbs colors other than red from light?
Yes, if the object is red its because it reflects red and absorbs colours other than red from light.


If there is sunlight, and the air is full of droplets, then it is impossible to see a rainbow. True or false?
True.


Are different colors of light carried by light waves that have diferent wavelengths?
Yes, different colours of light are carried by light waves that have different wavelenghths.


Can a second prism recombine colors to form white light?
Yes, a second prism can recombine colours to form a white light.