All Questions
Tagged with refraction lenses
135
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Optics question: Simple way to transform a parallel bundle of collimated beamlets into a converging (diverging) bundle of collimated beamlets?
I'm searching for an optical element that converts a parallel bundle of individually collimated beamlets into a converging or diverging bundle of still collimated beamlets (or vice versa). So ...
- 181
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3
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441
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Does using thinner glasses have any effect on how the eye look?
My daughter asked me to buy thin glasses for her eyes. So the power of the lenses are the same, but the glasses are thinner because the glasses use plastic with higher refraction index.
Latter I found ...
- 601
2
votes
1
answer
38
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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
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422
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Hyperbolic lens shape and aspheric surfaces
In Optics, Hecht, the author states that the perfect surface for a lens shape will be a hyperbola.
He essentially derives this answer by writing the optical path length from F1 to A, then A to D, and ...
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151
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Refractive Index of a Aspheric lens
I have the following specifications of an aspheric lens:
AL5040-B - Ø50 mm S-LAH64, f = 40 mm, NA = 0.54, ARC: 650-1050 nm
Is there a way to calculate or identify the refractive index of the lens ...
1
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1
answer
106
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Thin layer of air between lenses in contact
consider the following case for thin lenses
Case 1: lens between two different medium
applying refraction through curved surfaces two times and subtracting -
$$\frac{\mu_{oil}}v - \frac{\mu_{air}}u = ...
- 379
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2
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907
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Can we tell on which side of a lens an image appears?
Suppose I look through a single, thin, converging lens at an object on the opposite side. Depending on where the object is placed, the lens will either produce a real image on the side of the lens ...
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280
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Geometric optics explanation of lateral (transverse) chromatic aberration
The majority of pictures explaining lateral(transverse) chromatic aberration look like this
Here the focal point for red light is shifted closer to the optical axis and the focal point for blue light ...
2
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3
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440
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How does the combination of lens create a sharper image?
There's a line in a book which states that the combination of lens helps create a sharper image, but I don't understand how. Does more magnification mean sharper image?
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1
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Why aren't negative diopter glasses invisible?
If the diopters of a set of glasses determine the thickness, and higher diopters determine a thicker glass, why aren't negative diopter glass lens invisible?
user333186
4
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4
answers
1k
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What is the angle of a ray passing through a thin lens?
Let's say I have a thin lens model of an optical system. When I have a ray that is parallel to the optical axis, the situation is quite standard - the ray refracts and passes the focal point f (see my ...
- 63
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2
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457
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Absolute refractive index and power of lens
The power of a lens is the degree by which the lens can bend light, and the absolute refractive index is also the same. What is the difference between them? Is the power of a lens an absolute ...
user325981
0
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231
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Is sign convention necessary in the following equation?
The above diagram is used to derive the following equation which is about the refraction due to the spherical surface.
$$\frac{n_2}{v} - \frac{n_1}{u} = \frac {n_2-n_1}{R}$$
The above equation is ...
- 817
-1
votes
1
answer
141
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Refractive indices of liquid crystal
Refractive indices of liquid crystal • The birefringence is critical to the optical properties of the liquid crystal and underlies many of the applications of liquid crystals. • By reorienting the ...
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Deriving the thin lens formula from the lens maker formula
I've been studying refraction recently, and I faced some doubts regarding the thin lens approximation. The thin lens formula is given as :
$$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$$
However, I also know ...
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