All Questions
17
questions
1
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136
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Is it true to say no refraction takes place when a ray comes along normal drawn to interface?
Many books and websites in our country say that there are two conditions for no refraction of light:
If index of Refraction of media on both sides is same.
If the ray of light falls normally on the ...
- 1,357
1
vote
1
answer
171
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Appearance of underwater light source to an observer [closed]
I came across this question
A lightsource of diameter 10cm is placed 2m underneath the surface of a pool, a person
5m away from the edge of the pool saw a circle of light emitting from the lamp.
...
- 133
2
votes
1
answer
277
views
What happens to light ray moving from one transparent medium to other at the angle of incidence $90^{\circ}$?
I think when a light ray moves from one transparent medium towards other at $90^{\circ}$ incidence angle,it will not suffer refraction but continue to move indefinitely in the initial medium. But, if ...
- 227
0
votes
1
answer
53
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Percentage of light less than the critical angle? [closed]
I am stuck on the following question:
"Calculate the fraction of the light incident on the surface with an angle less than the critical angle for total internal reflection"
The context of ...
- 1
0
votes
2
answers
5k
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Which of the following phenomena are responsible for rainbows?
Which of the following phenomena of light are responsible for the formation of a rainbow?
1) reflection, refraction, dispersion
2) refraction, dispersion, total internal reflection
3) ...
- 139
1
vote
1
answer
551
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Refractive index and optical fibre question
This is an A level AQA question:
A signal is to be transmitted along an optical fibre of length 1200m. The signal consists of square pulses of white light and this is to be transmitted along the ...
- 111
1
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0
answers
124
views
Why will the beam of light diverge in this case? [closed]
I came across a JEE Mains question, which I found pretty confusing after seeing the actual answer. Here is the question:
An initially parallel cylindrical beam travels in a medium of refractive index ...
- 205
2
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0
answers
472
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Integrating over Snell's law with a varying index of refraction [closed]
I am working on a research practical and I encountered the problem of having to integrate over Snell's law. The exact problem is that I have a varying index of refraction, which is a function of the ...
0
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2
answers
380
views
Condition for constructive interference of light question
The question was asking me to find an expression for the constructive interference between light which follows the paths $PQ$ and $PRS$, once the light has reached the air outside of the two glass ...
- 1,525
3
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4
answers
5k
views
1
vote
1
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7k
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Calculating angle of min deviation of prism [closed]
Two rays incident with angle 40 and 60 on one face of equilateral triangular prism the angle of deviation are equal .find angle of minimum deviation?
0
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1
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2k
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Angle of minimum deviation
A prism of angle $60^\circ$ deviates a ray of light through $40^\circ$ for two angles of incidence which differ by $11^\circ$. What is the refractive index of the glass of the prism?
If we are given ...
- 711
0
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1
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139
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Differences in speed of light calculations in glass
I wanted to determine the speed of light in glass by using both of the following formulas :
$$v = \frac{1}{\sqrt{\mu \epsilon}} \simeq \frac{1}{\sqrt{\mu_0 \epsilon_r \epsilon_0}} \;\;\; \text{and} \;...
- 75
1
vote
2
answers
987
views
Is there a formula to calculate the deviated angle of a ray passing through a prism?
I'm assuming the angle of incidence to be the number of degrees from a perpendicular line on the side of a prism the ray starts passing through... I'm trying to figure out the angle the ray would be ...
- 11
2
votes
1
answer
2k
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Determining the path of a light ray
Let's consider a ray in the plane $xy$. Let the refractive index be defined in any point of the plane with the function $n(x,y)$.
In time $t=0$ the ray is located in coordinates $(x_0, y_0)$ and its ...
- 567