what is the condition needed for reflection of light
Answers
Answer:
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.
Explanation:
Answer:
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.
Explanation:
There are two conditions for total internal reflection of light to take place :
(1) Light has to travel from denser medium to rarer medium but not vice-versa.
(2) Critical angle of the medium θ
where n is the refractive index.
Angle of incidence θ must be greater than the critical angle of medium θ
As the angle of incidence is increased, the angle of refraction also increases. At a certain angle of incidence, the light will refract 90 degrees and travel along the boundary between the two media. This angle of incidence is called the critical angle. The critical angle varies for different materials, but it is useful to know that it is around 42 degrees for glass. You will be reminded of this fact in the exam. The diagram below shows light hitting the glass-air boundary at an angle that is equal to the critical angle.
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