How we see
The electromagnetic spectrum pictures light travelling as a __________.
Wave.
How did the ancient Greeks believe we see?
What type of telescope uses a mirror?
Reflecting telescope.
What is a simple definition of refraction?
Light bending
What was different from the sheep's eye that we dissected compared to a human's eye?
It has a tapetum and an oval pupil
What do the cones do in our eyes?
It helps us see colour. There are red, blue and green cones that work together to help us see every colour.
What is the function of the rods in our eyes?
Objects appear _______ when all the colours of light are reflected off the object and mix before meeting our eyes.
White
Refraction occurs because...
Light moves between different densities.
When white light hits a orange object what happens to the colours in white light?
Orange reflects into our eyes and the rest of the colours are absorbed by the object
Light rays focus on what part of our eye allowing us to see?
Retina
What is the most clear material that light can travel through?
Transparent
What is the law of reflection?
The angle of incidence is equal to the angle of reflection
What happens when light travels through a prism?
The colours in white light separate into a rainbow.
Give 5 examples of natural light sources
Sun, Stars, Lightning, Fire, Bioluminescence
When light travels through the lens in our eye what is unique about the image that is sent to our brain?
It is upside down. Our brain must invert it!
What are the 4 properties of light?
1. Light travels in a straight line
2. Light can be reflected
3. Light can be refracted
4. Light is a form of energy that we can see
What happens to light when it hits a concave mirror?
Converges
Light rays converge.
Convex mirrors
Explain how we see yellow light.
Yellow is kind of close to red and kind of close to green so both cones respond and our brain thinks yellow.
High frequency light looks ________.
Violet
What is an example of a concave mirror?
Spoon, binoculars, make up mirror, etc
What type of lens is needed to correct the vision of someone who is far-sighted?
Double convex lens
What is the cost of having a 100W lightbulb left on for 12 hours at 8 cents per kilowatt hour.
9.6 cents