All Questions
Tagged with reflection homework-and-exercises
72
questions
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Relativity problem about light signals and rockets equipped with mirrors [closed]
I find in a relativity book a problem that states:
"A rocket with its own length $L$ moves away from Earth at a constant velocity $v$. A radar signal emitted from a ground station is reflected ...
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1
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52
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My explanation of interference contradicts known result (standing waves) - did I add phase wrong?
This is based on question 5d from this A-Level Paper (OCR A 2023 Paper 3):
Plane-polarised microwaves are sent out from a transmitter aerial to a parallel receiver aerial. Behind the receiver, along ...
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2
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59
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Using Fermat's principle to derive the Cartesian paraboloid
I am self-studying Optics by Pedrotti and I'm on the subject of geometric optics, specifically ideal Cartesian surfaces. These are reflecting or refracting surfaces that form perfect images. I was ...
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Which distance to be used for object distance, in mirror formula? [closed]
I know that mirror formula is, $$\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$$ but there's a doubt in the following case,
Here to solve the problem, what value should i put for u in mirror formula, u1 ( ...
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1
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61
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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
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110
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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
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1
answer
556
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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,...
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1
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342
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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 ...
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1
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328
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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 ...
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1
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274
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Find the velocity of the image wrt ground.The mirror is at rest and the object is moving perpendicular to the axis with $5~\mathrm{cm/s}$ as in figure [closed]
Find the velocity of the image with respect to the ground. The mirror is at rest and the object is moving perpendicular to the axis with $5~\mathrm{cm/s}$ as in figure.
From this solution, I ...
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1
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53
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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 ...
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1
vote
1
answer
46
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Real or false image formation of a plane mirror and lens [closed]
If an object is placed in-between a plane mirror and a convex lens. Would the image that results from the reflection off the plan mirror into the lens be real.
Rough diagram:
Plane mirror------Object--...
- 11
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1
answer
32
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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 ...
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57
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Problem of lens distance - Geometrical optics
I'm study geometrical optics and I'm doing an exercise which says:
To the left of a thin lens an object is located at a distance p in various positions, indicated in the table. For each of the ...
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1
answer
70
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A confusion related to optics
I am a high school student and I am a little confused about a topic, My confusion is that,
(say an object is $1$ dimensional) I doubt optics while studying the formation of image what we do is take $2$...
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