| Polarised light | |||
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| Photoelasticity in plastic Plastic sandwiched between crossed Polaroid filters |
Photoelasticity in plastic Plastic sandwiched between crossed Polaroid filters |
View through car windscreen without Polaroid sun glasses. | View through car windscreen with Polaroid sun glasses. |
| Rainbows | |||
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| Rainbow | Rainbow | Rainbow | |
| The Eye | |||
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| Fundus camera picture of left eye | |||
| Diffraction of light | |||
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| Dispersed laser beam diffracted by a razor blade | Dispersed laser beam diffracted by a razor blade | Dispersed laser beam diffracted by a razor blade | Dispersed laser beam diffracted by a the eye of a needle |
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| Dispersed laser beam diffract by a pin head | Dispersed laser beam diffracted by open scissors |
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| Interference of light | |||
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| Laser beam on double slit with separation of 0.27mm Slit to screen = 7.5m Distance for 10 fringe spacing =0.175m |
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| Spectra | |||
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| Spectrum from a glass prism | Spectrum from a 300 lines/mm grating. Note it is the opposite way round to the prism spectrum. |
Candle seen through diffraction gratings. The top is 100lines/mm and the bottom is 300lines/mm |
A white LED viewed through diffraction glasses |
| Refraction | |||
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| Spoon in a glass of water | Pen in a glass of water | Refraction through a perspex block. The light enters on the left and emerges parallel on the right. Light is also reflected as it enters the block |
As the angle of incidence becomes greater, the brightness of the reflected light also increases. Light is also relfected internally within the block |
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| Refraction through a 60° prism. Light enters from the left |
Total internal reflection in a 90° prism. Light enters from the left |
Total internal reflection in a semi-circular perspex block. Light enters from the left |
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| Converging Lenses | |||
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| Thick biconvex lens Rays cross at the focus Light enters from the left |
Thin biconvex lens Rays cross at the focus Light enters from the left |
Thick plano-convex lens Rays cross at the focus Light enters from the left |
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| Diverging Lenses | |||
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| Thick biconcave lens Rays appear to cross at a focus behind the lens Light enters from the left |
Thin biconcave lens Rays appear to cross at a focus behind the lens Light enters from the left |
The focal length of the converging lens is increased by the diverging lens Light enters from the left |
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| Mirrors | |||
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| Convex mirror - diverging Rays appear to cross at a focus behind the mirror Light enters from the left |
Concave mirror - converging Rays cross at the focus infront of the mirror Light enters from the left/td> | ||
| Old cameras | |||
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| Agfa bellows camera ~1940s | Coronet Ambassador ~1930 | Box camera ~1920s | Kodak Brownie 127 ~1960 |
| Miscellaneous | |||
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| Peacock feather | Caustic curve in a saucepan full of sugar | Electron diffraction through graphite | |