Sound travels better through solid objects than through gases. Why?
The particles in a solid are more dense, so there is less distance for a particle to travel before it hits the next particle.
What is the retina made of?
Light sensitive cells
We see the colour black when
all colours of light are absorbed
Near sightedness is when someone can't see things that are far away clearly. How can we fix this? (be specific)
Glasses with concave lenses
Refraction is
when light goes from one medium to another and the light bends
What are the seven colours of the rainbow?
red, orange, yellow, green, blue, indigo, violet
Sound needs _____________ for the sound waves to travel
particles
There are 2 cats laying in the sun. Why is the black cat warmer?
Because black absorbs all the light and light waves create heat
Why does a orange look orange?
When light hits the orange the orange light bounces off and the rest of the colours are absorbed
What is the job of the cornea
protects the eye
What type of lens makes light waves come together? (convex or concave)
Convex
Where is the retina?
At the back of your eye
What type of lens makes light rays spread out? (Convex or concave)
Concave
Light travels in
waves
Is the lens in our eye concave or convex?
Convex
If it is very dark will your pupil get bigger or smaller?
bigger
Draw a picture of a lens that will make light rays come together.
Visible light is..
the light waves that we can see. Some light waves (such as UV) are invisible.
Reflection is
when light bounces off an object
White light is made of...
All the colours
What is Colour blindness caused by?
The retina can't seperate some colours, so they look the same.
What is colour blindness?
Colour blindness is an affliction where the person cant see all colours properly. This means that some colours (such as yellow and red) look the same.
Sound travels in
waves