
A ray of light intensity is incident on a parallel glass slab and refraction. At each reflection, of incident energy is reflected. The rays and undergo interference. The ratio of and is
A.
B.
C.
D.

Answer
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Hint:
Here first we have to find the value of and and then the ratio of and .At last we have to find the ratio of and
Complete step by step solution:
Given,
A ray of light intensity is incident on a parallel glass slab and refraction.
At each reflection, of incident energy is reflected.
The rays and undergo interference.
Since, is incident on a parallel glass slab and incident energy is reflected.
So,
Now let and
Now let us find the ratio of and
So, the ratio of and is
Hence, option A is correct.
Additional information:
Total internal reflection and critical angle- In optics total internal reflection is the complete reflection of a beam of light in a medium such as water or glass back onto the medium from the surrounding surfaces. If the angle of incidence is greater than a certain limiting angle, called the critical angle, the phenomenon of total internal reflection occurs.
Reflection on a glass slab- As light penetrates the glass slab through air, they are refracted and bend towards the normal. The path of the refracted ray now shifts again as it comes into the air from the glass plate. If the beam of light passes from a denser to a rarer medium, it bends away from the normal.
Note:
Here we have to keep in mind that at each reflection, incident energy is reflected. So, the value of each incident ray will be different. Also for the formula of , we cannot swap the numerator and denominator in confusion. So, we have to be very careful while solving this.
Here first we have to find the value of
Complete step by step solution:
Given,
A ray of light intensity
At each reflection,
The rays
Since,
So,
Now let
Now let us find the ratio of
So, the ratio of
Hence, option A is correct.
Additional information:
Total internal reflection and critical angle- In optics total internal reflection is the complete reflection of a beam of light in a medium such as water or glass back onto the medium from the surrounding surfaces. If the angle of incidence is greater than a certain limiting angle, called the critical angle, the phenomenon of total internal reflection occurs.
Reflection on a glass slab- As light penetrates the glass slab through air, they are refracted and bend towards the normal. The path of the refracted ray now shifts again as it comes into the air from the glass plate. If the beam of light passes from a denser to a rarer medium, it bends away from the normal.
Note:
Here we have to keep in mind that at each reflection,
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