Light Flashcards
what does light travel in, and what do we call it?
in straight lines, we call each line a ray.
how long does light take to get from the sun to the earth?
8 and a half minutes/20 000 seconds
how fast does light travel?
300 000 000 metres per second
what are the three things light can do when it hits an object?
go through (be transmitted)
bounce back (be reflected)
be absorbed
what is the light hitting a mirror called?
the incident ray
what is the light leaving a mirror called?
the reflected ray
what are periscopes used for?
- seeing over crowds
- observing wildlife
- in submarines
what is refraction?
when the ray of light entering a transparent substance bends towards the normal line
what needs to happen in order for you to see a rainbow?
the angle between the direction of sunlight and your line of sight to the raindrops needs to be at about 42 degrees
why does a red object look black in green light?
as a red object only reflects red, it would absorb the green light
