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| Back | Zero. |
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| Front | How is Young's double slit experiment done? |
| Back | A laser produces monochromatic (all of same wavelength), coherent light.Two slits which diffract the light act like two identical sources of light.The two slits must be the same width, and be close in width to the wavelength of the laser light to diffract it. |
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| Front | If light hits a boundary exactly at the critical angle... |
| Back | the light is reflected along the boundary |
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