p5f nature of waves
TRANSCRIPT
P5f Nature of waves
P5f - Nature of wavesInterference of waves
Constructive
Destructive
Revision - Diffraction
• Diffraction is…
• Maximum diffraction happens when…
What if there are 2 gaps?
Diffraction patterns• When waves are ____________
by two slits they overlap which causes _____________
• _______________ interference cancels the waves out leaving blank spaces
• _______________ interference builds the waves up causing bright patches
Diffraction of light• Light is ________________ radiation with a very ________
wavelength (400-700 nm)
• Light waves can be ____________ when they pass through
very small gaps (50 m) and can _____________ when they
overlap
Draw the laser diffraction pattern you saw in the box above
Diffraction of light
You can stick you ‘rainbow’ here
Path difference• Path difference is the
difference in how far the waves have traveled
• Even number of 1/2 wavelengths = constructive
• Odd number of 1/2 wavelengths = destructive
Polarisation
• Light waves are an
example of
____________ waves
• Not only do the go up
and down, they also
go ______ to ______
and in all other
directions
Polarisation - Polarising filters
Polarising filters• Polaroid plastic
polarises light so that only the vibrations in either the __________ or the ___________ direction are allowed to pass
• If two polarising filters are crossed then…
Polarisation - 3D movies