All Questions
29
questions
1
vote
1
answer
71
views
Snell's Law- Extraordinary ray
I applied the snell's law to find the angle of refraction of the Ordinary and Extraordinary ray. And I got the correct answer 3.51. But I know my approach to the question is wrong because I applied ...
2
votes
2
answers
130
views
Do Normal Incidence contradicts the definition of refraction?
Professor told our class that if someone wants to define refraction in words, it can be done as the following, The deviation of light from its path when it passes from one medium to another is called ...
user380777
1
vote
0
answers
23
views
I need to figure out the length of a crystal to move a light beam [closed]
I need to figure out the length of a crystal to move a light beam shining through it.
The height is known, and so is the refractive index of the crystal and its length. What I can't figure out is the ...
- 119
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
353
views
Question about a specific geometrical optics/Fermat's principle problem and it's given solution
I'm studying the following question
P119 On a spherical planet, the refractive index of the atmosphere, as a function of altitude $h$ above the surface, varies according to the formula
$$n(h) = \frac{...
- 83
0
votes
1
answer
323
views
Behavior of a laser beam in a spherically symmetric medium [closed]
A laser beam propagates through a spherically symmetric medium. The refractive index varies with the distance from the centre of symmetry $r$ according to the equation:
$$
\mu=\mu_0\frac{r}{r_0}
$$
...
0
votes
1
answer
53
views
How can the image be any size orher than the object?
Am image is just the set of images of all the points on the thing. The complete image has to be the same size as the object if there is exactly one image for each point on the object forming it. So an ...
- 51
2
votes
1
answer
103
views
Refraction of light but slightly twisted
This is the question:
(I haven't bothered to type it because anyway I needed to put the picture of the circles.)
So, now what I did first was basic stuff and found that the first angle of refraction ...
- 186
0
votes
1
answer
148
views
Snell law with two unknowns [closed]
I having troubles with a basic geometric optics exercise which says:
The image shows a glass block immersed in water ($n_\text{water}=1,33$). What it’s the refraction index $n_\text{glass}$ of the ...
- 179
0
votes
0
answers
11
views
Why does a qualitative analysis of this question about refraction differ from the answer found through the application of the equation?
Suppose that an object O is in glass ($ \mu $ = 1.5), 6.5 cm from a spherical glass-air interface (from P in Figure 1) where glass is on the concave side and air is on the convex side. In the diagram ...
- 363
0
votes
1
answer
341
views
Focal length of lens combination [closed]
The adjacent figure shows a thin plano-convex lens of refractive index $μ_1$ and a thin plano-concave lens of refractive index $μ_2$, both having same radius of curvature $R$ of their curved surfaces. ...
- 149
2
votes
1
answer
3k
views
Derivation for optical path length and the origins of the formula
So I've learnt that the formula for optical path length is $OPL = ns$, where $n$ is refractive index of the medium and $s$ is its geometrical length, the problem is i cant really get around this ...
- 21
-3
votes
1
answer
53
views
Problem involving lenses and mirrors [closed]
A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance
between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm
from the lens. The final image ...
- 47
0
votes
1
answer
67
views
Optical shift in a view from above
In the following case, two objects are moving to each other from two different media:
Apparently, the distance between the two, at this moment, is not the sum of $6$ and $0.8$, but involves dividing ...
- 256
2
votes
1
answer
909
views
How to graphically determine equivalent focal length of two thin lenses?
Suppose we have the schematic above. The first lens has a focal length of 80mm and the second one has a focal length of 60mm, and both are biconvex. My job is to determine, graphically the equivalent ...
- 637