All Questions
71
questions
1
vote
1
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71
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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 ...
-1
votes
1
answer
61
views
When does magnification not depend on distance of object? [closed]
Two thin lenses share a common optical axis. Their focal lengths are f1 = 20 cm, respectively and f2=50 cm. In front of the first lens at distance x>f1 there is an item. On the screen behind the ...
- 1
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
0
votes
1
answer
61
views
Why the angle between incident ray and normal is 0° and not 180° if incident ray is directed perpendicular to "plane" of plane mirror?
Here the incident ray is normal to the plane of plane mirror, that is obvious but why everybody say that this ray is making an angle 0° with normal, why the angle is not 180° ? Are they relating it ...
user378646
2
votes
0
answers
110
views
What is the exact reason of using sign convention to derive mirror formula & if it's done already then why sign convention is used again for problems
Today i studied about mirror formula, its derivation and sign convention used while deriving it, a question which i have is, why do i have to use sign convention while doing the derivation ? focal ...
user380777
0
votes
1
answer
556
views
Number of images formed by 3 plane mirrors forming equilateral triangle [closed]
Three plane mirrors are kept as shown in the figure. A point object O is placed at the centroid of the system. How many images are formed?
The solution here made 3 circles, one for each pair of sides,...
- 324
-1
votes
2
answers
440
views
$r_1+r_2= A$ in prisms
In class we derived a result which said that the sum of the 2 angles of refraction in a triangular prism $r_1+r_2$ is equal to the angle of the prism $A$. The proof goes like this
Over here, it is ...
- 252
1
vote
0
answers
35
views
Calculating Pin Placement for Self-Image Formation in a Concave Mirror with Liquid Fill
The question is as follows:
Figure shows a concave mirror of focal length F with its principal axis vertical. In mirror a transparent liquid of refractive index μ is filled upto height d. Find where ...
2
votes
0
answers
68
views
Calculation of sound speed profile for positive speed gradient
I have started exploring geometrical acoustics/optics in the oceans. I came across a problem that I have been working on for two days. I have mostly solved it, but I am missing just the final step and ...
0
votes
1
answer
46
views
Total focal length and magnification
I would like to realize an image of the cantilever. The dimensions are (450x50) microns. I would like to use a self-constructed telephoto lens. This consists of two lenses. The image magnification can ...
- 1
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
0
votes
1
answer
328
views
Concave mirror and convex mirror placed facing each other [closed]
A convex mirror in a concave mirror each of focal length f are placed coaxially. They are separated by 4f and their reflecting surfaces face each other. A point object is kept on the principle axis at ...
- 15
-1
votes
1
answer
111
views
Angular aperture of diverging beam after passing through a diverging lens
Consider an optical set-up as shown in the plot below: A light source, e.g. a laser diode, of diameter $d$ ($\approx$ 1 mm, but numbers are unimportant) is emitting a divergent beam having a half ...
- 1,803
-1
votes
1
answer
93
views
A problem on Equivalent focal length
This is a combination of three lenses whose equivalent focal length is to be found. Solving for the focal length of the first lens was not a problem, it was obtained by applying Lens-Maker's Formula ...
- 1,638
1
vote
0
answers
35
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Angles with oblique incidence and polarization [closed]
I need help with a exercise, i have problem with angles.
A circular wave of left hand with |E| = 1 V / m affects the interface between two media with refractive indices n1 = 1.45 and n2 = 4.1 with an ...
