All Questions
32
questions
0
votes
1
answer
45
views
What is a convex-concave lens?
I came across this term while studying for optics, and I'm unsure as to what this means. My thinking is that it might be a meniscus lens, but the text separately give two different models for each ...
- 187
0
votes
2
answers
75
views
Is there a way to calculate the angle between the refracted and reflected rays given the refractive index?
Is there a way to calculate the refracted and reflected rays? I know we use Snell's law to calculate the refracted rays, but is there a formula to calculate the angle of the reflected rays, or does it ...
- 187
2
votes
0
answers
35
views
Apparent position of object in bowl of water
Say you have a bowl of water and you keep an object in it. What would the apparent position of an object inside the bowl from the position of an outside observer? Will the curvature of the spherical ...
- 187
10
votes
2
answers
2k
views
Is it possible to witness a rainbow while facing the sun?
We know that a rainbow occurs due to the refraction and reflection of light inside raindrops. We also know that inside spherical raindrops total internal reflection is not possible. So some light is ...
- 123
0
votes
0
answers
66
views
Why is there only one angle of incidence that gives minimum deviation in prism?
On plotting the angle of deviation vs the angle of incidence for a prism, we find that the graph dips only at one point. It is this result that is later used to prove that for minimum deviation to ...
- 252
1
vote
1
answer
136
views
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
3
votes
2
answers
452
views
What exactly is "dense" in Optical Density?
My book states that:
When passing from one medium to another, if light slows down, the second medium is said to be optically denser than the first medium, and if light speeds up, then the second ...
- 1,168
2
votes
3
answers
440
views
How does the combination of lens create a sharper image?
There's a line in a book which states that the combination of lens helps create a sharper image, but I don't understand how. Does more magnification mean sharper image?
- 21
0
votes
2
answers
87
views
Can we witness Optical illusion in which sun appears to set in mid sea than at horizon?
I was searching for optical illusions and came across a video on youtube where sun seems to set in the mid of sea instead of setting at the horizon? Can anyone please explain how this illusion takes ...
- 1,357
0
votes
2
answers
598
views
Is rainbow formed in front or behind of a water droplets?
Single water droplet gives rise to formation of only a small part of rainbow.
Is that part formed in between observer and droplet or behind the droplet and not between them?
0
votes
1
answer
22
views
Intuitive Explanation behind algebraically adding the vertical shifts produced by transparent objects
Given are two transparent slabs of different refractive indexes, a point object is placed at the bottom of $B$. My book says that the total shift produced is the algebraic sum of the shifts of each ...
user318780
0
votes
0
answers
40
views
Why angle of refraction parallel to base of triangle in triangular prism? [duplicate]
My textbook says that:
At minimum deviation of a triangular prism, the refracted ray is parallel to the base of the triangle
But I feel like it's only possible if the triangle is isosceles or ...
- 11
1
vote
2
answers
250
views
Angle of deviation in a prism given ONLY the prism angle
This is NOT about calculating the minimum deviation of a prism. You are given only two pieces of information: the angle of the prism, the refractive index of the medium (glass), and you know that the ...
- 13
0
votes
1
answer
838
views
Path of light ray through varying refractive index
Suppose light ray passing through a medium with refractive index $n=n(y)$. In the case of an inhomogeneous medium in which $n$ varies continuously in the $y$-direction, We have curved rays that ...
- 11.9k
1
vote
3
answers
163
views
Law of refraction
In my textbook it is given that "The refractive index of a substance does not depend on the angle of incidence"
But
...
- 91