What should be the minimum thickness of this film?
1 answer:
Answer:
is the minimum thickness of the coating of given material.
Explanation:
This method of application of non reflective coatings uses the phenomenon of destructive interference in which the the waves reflected from the top surface of the coating are out of phase to the waves reflected from the bottom layer of the coating.
Given that:
refractive index of coating,
refractive index of glass,
wavelength of light,
<em>(Here we observe that refractive index of air<refractive index of coating<refractive index of glass)</em>
We have the mathematical relation for film thickness 'd' as:
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The initial height of the first body is given by:
where
g is the gravitational acceleration
t is the time it takes for the body to reach the ground
Substituting t=1 s, we find
The second body takes takes t=2 s to reach the ground, so it was located at an initial height of
The second body started its fall 1 second before the first body, therefore when the second body started its fall, the first body was located at its initial height, i.e. at 4.9 m from the ground.
where
g is the gravitational acceleration
t is the time it takes for the body to reach the ground
Substituting t=1 s, we find
The second body takes takes t=2 s to reach the ground, so it was located at an initial height of
The second body started its fall 1 second before the first body, therefore when the second body started its fall, the first body was located at its initial height, i.e. at 4.9 m from the ground.