Hint
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Answer
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What is a coherent source of light
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Same frequency and constant phase difference
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What is d in nλ=dsinθ
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Distance between slits in a diffraction grating
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What is D in w = λD/s
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Distance between the double slits and the screen
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What is a diffraction grating
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A series of many, closely spaced parallel slits
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What is the effect of decreasing wavelength at a single slit
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Diffracted waves spread out less
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What is the effect of reducing the size of a single slit
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Diffracted waves spread out more
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What is the effect of reducing the spacing of slits in a diffraction grating
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Increases the angle of each beam
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What is the fringe pattern for a single slit
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Central fringe is twice the width of all others. Outer fringes are much less intense than the central maximum.
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What is the fringe pattern for double slits
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Spacing of fringes is constant (and intensity reduces gradually from the centre)
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What happens if white light is used in the two slit experiment
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Central fringe is white, inner fringes run have violet on the inside edge and red on the outside edge.
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What is the maximum beam order from a diffraction grating
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d/λ (rounded down to the nearest whole number)
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What is n in nλ=dsinθ
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Order of the beam
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How many beams are produced by a diffraction grating?
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2n+1 where n is the maximum beam order
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What is the path difference for constructive interference
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path difference = nλ (where n is an integer, n=0,1,2,3,4...)
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What is the path difference for destructive interference
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path difference = (n+1/2)λ (where n is an integer, n=0,1,2,3,4...)
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What is the path length difference between adjacent slits along the nth order beam
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n wavelengths
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What produces a bright fringe
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Constructive interference of the light from each slit
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What produces a continuous spectrum of light
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Hot objects such as filament lamps and the sun
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What produces a dark fringe
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Destructive interference of the light from each slit
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What produces coherent, monochromatic light
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Laser
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what is s in w = λD/s
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Distance between the double slits
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Slit spacing (m) for a diffraction grating is equal to
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1 / number of lines per metre
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What was used by Young to provide coherent light for the two slits
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Narrow single slit
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What is w in w = λD/s
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Fringe separation
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What is a zero order beam
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The central bright beam
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