What are the conditions for the following: (a) reflection, (b) refraction, (c) constructive and destructive diffraction to occur?
Answers
Condition necessary for Reflection:
the light must be travelling from a more dense medium into a less dense medium (ie glass to air) the angle of incidence must be greater than the critical angle.
Condition necessary for Refraction:
For refraction to occur substances must be transparent and light ray must pass from region of one index of refraction to another i.e. both substances should have different refractive indices should and the light ray must impinge at an angle other than normal which must not be less than the critical angle.
Condition necessary for constructive and destructive diffraction to occur:
The proper way to define the conditions for having constructive or destructive interference requires knowing the distance from the observation point to the source of each of the two waves. Since there must be two waves for interference to occur, there are also two distances involved, R1 and R2.
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Condition necessary for Reflection:
the light must be travelling from a more dense medium into a less dense medium (ie glass to air) the angle of incidence must be greater than the critical angle.
Condition necessary for Refraction:
For refraction to occur substances must be transparent and light ray must pass from region of one index of refraction to another i.e. both substances should have different refractive indices should and the light ray must impinge at an angle other than normal which must not be less than the critical angle.
Condition necessary for constructive and destructive diffraction to occur:
The proper way to define the conditions for having constructive or destructive interference requires knowing the distance from the observation point to the source of each of the two waves. Since there must be two waves for interference to occur, there are also two distances involved, R1 and R2.
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