PROPERTIES of WAVES INTERFERENCE Interference in a Ripple

OUTCOMES • • Comparing results Drawing conclusions Applying knowledge Considering historical perspectives;

Interference of water waves • Interference occurs when 2 circular wave fronts exit two

Do you remember? Constructive interference – when a crest meets a crest or a

Destructive interference – when a crest meets a trough, their amplitudes are subtracted. If

DRAWING CONCLUSIONS Nodal lines are lines of zero disturbance caused by destructive interference. Anti

Light is allowed to pass through two, narrow, adjacent slits and the light pattern

$Interference of light Double slit diffraction and interference COMPARE THIS PATTERN TO THE Interference$

$Single slit diffraction and interference Young's double slit experiment$

$The diffraction grating Diffraction grating$

$A diffraction grating is a component of optical devices consisting of a surface ruled$

$The tracks of a compact disc act as a diffraction grating, producing a separation$

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PROPERTIES of WAVES INTERFERENCE Interference in a Ripple Tank click here

OUTCOMES • • Comparing results Drawing conclusions Applying knowledge Considering historical perspectives;

Interference of water waves • Interference occurs when 2 circular wave fronts exit two slits in a barrier or when two beads vibrate in phase in body of water. Ripple Tank Simulation click here

Do you remember? Constructive interference – when a crest meets a crest or a trough meets a trough in the same medium, their amplitudes are added together to form a bigger crest or trough. Interference of coherent waves

Destructive interference – when a crest meets a trough, their amplitudes are subtracted. If their initial amplitudes were the same, the resultant amplitude will be zero. Interference of two circular or spherical waves click here Interference of circular waves

DRAWING CONCLUSIONS Nodal lines are lines of zero disturbance caused by destructive interference. Anti nodal lines are lines of greater disturbance caused by constructive interference. (crest & trough) 2 crests or 2 troughs

Light is allowed to pass through two, narrow, adjacent slits and the light pattern on the screen is observed. Constructive Destructive interference Interference between two waves (point source) click here

$Interference of light Double slit diffraction and interference COMPARE THIS PATTERN TO THE Interference$

Interference of light Double slit diffraction and interference COMPARE THIS PATTERN TO THE Interference of light at a double slit WATER WAVES PATTERN click here

$Single slit diffraction and interference Young's double slit experiment$

Single slit diffraction and interference Young's double slit experiment

$The diffraction grating Diffraction grating$

The diffraction grating Diffraction grating

$A diffraction grating is a component of optical devices consisting of a surface ruled$

A diffraction grating is a component of optical devices consisting of a surface ruled with close, equidistant, and parallel lines which resolves light into spectra. The different frequencies present in the white light are each diffracted to a different degree. (amount of diffraction ∝ λ. ) This “spreads out” the colours that are present in white light and a spectrum is observed. Diffraction grating

$The tracks of a compact disc act as a diffraction grating, producing a separation$

The tracks of a compact disc act as a diffraction grating, producing a separation of the colors of white light. Bending light from a laser beam