Refraction of waves Flashcards
What is a wavefront?
An imaginary line that connects all the same points in a set of waves.
Why does light refract as it passes from air into glass? (3 marks)
The velocity in the glass is ______, so the _____ of the wavefront entering the glass _________ _________.
But the part of the wavefront in the ___ continues travelling at a _________ velocity, causing a change in ___________.
lower
edge
slows down
air
higher
direction
Why is the violet light refracted the most when entering water? (3 marks)
Violet has the _________ ____________, so violet light travels the ________ in water.
Violet light then undergoes the ____________ change in __________.
shortest wavelength
slowest
greatest
velocity
When waves enter or leave a medium at right angles to the surface, do they change direction?
No.
