Light Booklet Flashcards
What is the word that means light travels in straight lines
Rectilinear propogation
What are the 3 rules for drawing ray diagrams
- Light rays are always drawn in straight lines with a sharp pencil and a ruler
- They always have one arrow per straight line to show the direction it is travelling in
- The light ray always travels away from the light source
What is the darkest point of a shadow called
The umbra
Large sources of light often have a blurred edge called a
Penumbra
White light is made up of…
Red, orange, yellow, green, blue, purple
What does rectilinear propagation mean
Light always travels in straight lines
How does light travel
In straight lines
How do we see colour
As the lines gut is reflected into our eyes and all the colours but one is absorbed the one left reflects into our eyes
What is the order of the colour spectrum
Red yellow green blue indigo violet
What is a solar eclipse
When the moon goes in front of the sun
What is a lunar eclipse
When the earth goes in front of the moon
What is the blurred part of the shadow called
Penumbra
What is the sharp area of the shadow called
Umbra
When are shadows atbthere shortest
Midday
When are shadows at there longest
Evening or morning
