All Questions
14
questions
0
votes
1
answer
342
views
How to derive Fresnel's tangent law?
In this Wikipedia post the $r_p$ Fresnel reflection coefficient is given by:
$$r_p = \frac{\tan{(\theta_i - \theta_t)}}{\tan{(\theta_i + \theta_t)}}.$$
How can this be derived from the previous ...
- 2,111
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
0
votes
1
answer
32
views
Evaluating whether a surface apperance is light or dark for the case incident light is in normal direction
The Question:
The system in the figure is illuminated in the normal direction
by wide monochromotic light source in the first environment.
Explain in detail the light and dark condition of the ...
-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
2
answers
260
views
Apparent depth WITH viewing angle [closed]
So i did one physics problem where I should find apparent depth of 3m deep pool(index between liquid in pool and air is (√7)/2) and we are looking at pool from 30° angle.
I go to our favorite friend ...
- 103
0
votes
2
answers
5k
views
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
0
votes
1
answer
611
views
Formation of a second image due to reflection at a boundary
To determine the refractive index of a transparent plate of glass, a
microscope is first focused on a tiny scratch in the upper surface,
and the barrel position is recorded. Upon further lowering ...
- 1,307
0
votes
1
answer
57
views
A Physics Problem Involving Refraction [closed]
I'm not sure how to solve this problem. I've considered using Malus' law, but then I don't know what theta is, preventing me from solving this problem.
- 23
3
votes
1
answer
239
views
When are the reflectance R and the transmittance T equal to each other at normal incidence?
Really struggling with this one.
Under what conditions would the reflectance R and the transmittance T be equal to each other at normal incidence at an interface? What would be the values of R and T ...
- 33
1
vote
1
answer
178
views
Reflective angles from a CD [closed]
How do I estimate the diffraction angles of laser light which illuminates a CD? Does the storage capacity have an impact?
Theories I have considered are:
refraction
diffraction
$\sin(\theta)=\frac \...
- 107
0
votes
5
answers
4k
views
Optical path difference
I have question about calculating optical path difference.
$$\Delta L = \mathrm{(BC+CD)}\cdot n_2 - \textrm{BF}\cdot n_1$$ - why calculating path difference here we are subtracting $\mathrm{BF}$ ...
- 101
-1
votes
1
answer
296
views
Reflection vs indices of refraction [closed]
A magician during a show makes a glass lens with refractive index 1.47 disappear in a trough of liquid. What is the refractive index of the liquid?
Could anyone please demonstrate with a ray diagram?
- 1,867
0
votes
1
answer
67
views
Evaluating angle of refraction [closed]
Can someone show me how to evaluate the angle of refraction for white light where the angle of incidence is 30 degrees if medium A is air and medium B is water. The answer is 22 degrees. I don't know ...
- 153
0
votes
2
answers
7k
views
Colors in the secondary rainbow reverse of that in the primary rainbow
Why the colors of Secondary rainbow is reverse of that in the color in the Primary rainbow?
What can be the possible reason among the following options
Because it is formed by one internal ...
- 351