![]() ![]() Where d is the distance between two slits and m is the ‘order’ of interference. When the difference in phase between two waves are exactly or a multiple of half a wavelength apart, they will undergo destructive interference. The intensity of band decreases with higher orders of interference. The order of interference begins with 0 which corresponds to the central band on the viewing board. When the difference in phase between two waves are exactly one wavelength apart, they will undergo constructive interference. In addition, the bright spots showed varying intensity and their position can be calculated for a given wavelength of light. Young’s qualitative observations showed that light cannot be particle in nature as this would otherwise produce only two bright bands directly behind the two slits. These spots spanned a larger distance than that between the slits and had alternating dark and bright spots (minima and maxima). ![]() However, Young instead observed multiple bright bands/spots on the viewing screen rather than just two. If light was a particle or consisted of particles, only light particles which pass through the slits would be observed on the viewing screen Young's observations supported the wave model of light. Newton's corpuscular (particle) model of light and Huygens' wave model of light made different predictions regarding the pattern of light formed on the screen. A viewing screen was set-up directly behind the double-slit apparatus. A monochromatic light source was shone through two narrow slits separated by a very small distance. In 1801, Thomas Young conducted an experiment using a double-slit apparatus. This is because the diffracted ray of light is lower in intensity the greater the angle of diffraction from the midline (θ). The intensity of each spectral band decreases away from the centre. This results in spectral bands or ‘ maxima’ of diffraction.
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