All Questions
Tagged with reflection lenses
78
questions
1
vote
6
answers
203
views
Real image drawn in case of concave mirror is bit off
About
I am trying to draw real image of object in front of concave mirror. Case is when object is lying on the Center of curvature.
What I have done so far
There are two rays
A ray incident on the ...
- 85
2
votes
1
answer
201
views
Lenses and missing reflection
I am wondering why reflected rays are not considered with lenses. If a ray strikes a surface, another is reflected off that striking point; however, this is not added when studying lenses, only ...
- 23
0
votes
0
answers
18
views
Final image formation in these 2 cases:
Can someone please explain simply how we determine how many times we have to consider reflection and refraction to obtain final image.
Example a:
Here they only considered refraction twice to obtain ...
0
votes
2
answers
59
views
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 ...
- 260
0
votes
0
answers
37
views
Why does focal length of a concave mirror $f=-R/2$?
When both the distances $R$ and $f$ are measured from mirror only they shouldn't be of sm sign? When we take it negative in mirror formula that I understood... But why here I'm confused
0
votes
1
answer
39
views
Magnification of closely packed thin lenses, or of closely packed lens and mirror
I was taught how to calculate the equivalent foci in both the cases. And since the formulae resemble the simple mirror and lens maker formulae, teacher said that this system is behaving like a single ...
- 41
0
votes
0
answers
30
views
Is it preferable to say $v$ is " image distance " than to say " image position " in spherical mirror formula?
I was going through spherical mirror formula $1/v + 1/u = 1/f$ where $u$, $v$ and $f$ are named as object distance, image distance and focal length respectively. But while using this equation we do ...
- 1,357
1
vote
2
answers
150
views
Why didn't I reach $\frac{1}{p}+\frac{1}{q}=\frac{1}{f}$?
In optics for convex and concave mirrors there is the following formula: $$\frac{1}{p}+\frac{1}{q}=\frac{1}{f}$$ where $p$ is the distance between the object and the mirror, $q$ is the distance ...
- 402
1
vote
1
answer
165
views
Strain on eyes when seeing a mirror [closed]
Suppose; The strain on my eyes when seeing an object at distance x is a.
The strain on my eyes when seeing an object at distance ...
- 23
2
votes
1
answer
38
views
Why are $\rm ZnSe$ beam-combiners typically "optimized" for a 45º angle of incidence?
Everywhere I look it seems that $\rm ZnSe$ beam combiners (as the ones sometimes used in $\rm CO_2$ [10600nm IR] laser cutters) are "optimized" or designed to work at a 45º angle of ...
- 21
2
votes
1
answer
150
views
How do normal incidence reflectometers work (optically) and why can't I understand the upper 45° optical surface in this diagram?
tl;dr I simply can not understand the orientation of the upper 45° optical surface.
In the semiconductor industry optical metrology is widely used to measure a combination of thin film thicknesses via ...
- 6,273
0
votes
1
answer
78
views
Absorbance measurement and lens reflection
I am experimenting with absorbance measurements. My optical configuration is shown in the image below. The lens after the fibre is used to collimate the light and the lens after the sample is used to ...
- 1
0
votes
3
answers
119
views
Is lens a type of mirror?
I saw the definition of 'lens' in an online portal as
Lens is a type of mirror which refracts the light instead of reflection
Is that true to say 'type of mirror'? Mirrors have an opaque surface in ...
2
votes
3
answers
200
views
Does anyone know of an adjustable focusing mirror?
Does anyone know of an adjustable focus mirror? Allowing short sight and long sighted people to see clearly in a mirror with no specs on. Is it even possible?
- 21
1
vote
1
answer
46
views
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