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Confusion about optic axis

In the book 'OPTICS' by Eugene Hetch it is written that, "the optic axis is actually a direction and not merely a single line".I can't understand why it is...

1

Physics Asked by user257564 on 4 years ago

Good at number games, bad at math

Is there a name for someone that's good at number games but bad at math?...

1

English Language & Usage Asked by Tere Watkins on 4 years ago

PGFplots - `addplot` and `foreach` won't compile

I am trying to use some of the TikZ and PGFMath tools (e.g. pgfmathdeclarefunction and foreach) to make plotting things easier. However, I can't get the following code to compile....

1

TeX - LaTeX Asked by Jordan Mitchell Barrett on 4 years ago

how to get rows with more than 1 appearance of a specific column in relational algebra

I have a table like this: PostId | Body | AuthorId 2 ...

1

Computer Science Asked by Mohammadreza on 4 years ago

How to easily convert utf8 tables to utf8mb4 in MySQL 5.5

I have a database which now needs to support 4 byte characters (Chinese). Luckily I already have MySQL 5.5 in production. So I would just like to make all collations...

10

Database Administrators Asked by geoaxis on 4 years ago

Can the Sigma TC-1401 1.4x Teleconverter be used with Canon lenses?

Essentially the inverse of this question - can a Sigma 1.4x Teleconverter (specifically the TC-1401) be used with (actual) Canon lenses, such as the EF 70-200mm f/4? By used,...

4

Photography Asked by exterrestris on 4 years ago

How can I convert lon, lat coordinates to x, y?

For machine learning, I need to convert an array of coordinates in lon, lat format to simple floats where x=0,y=0 will be a most southwest coordinate and x=1,y=1 most northeast,...

4

Geographic Information Systems Asked by Akim Akimov on 4 years ago

Canon 18-55mm lens giving err01 after it fell down

Sometime back I accidentally dropped my canon EFS 18-55mm lens (open caps); I cleaned the contact areas and any kind of dirt I could see on it. After that it...

2

Photography Asked by techy samco on 4 years ago

standard_init_linux.go:211: exec user process caused "exec format error"

I followed the answer given to Run simple X11 app in docker container on Ubuntu 20.04 precisely without any luck. I got the following error messages:standard_init_linux.go:211: exec user...

0

Ask Ubuntu Asked by Y. Huang on 4 years ago

Any open-source to animate 2D materials in 3D. (e.g. van der Waals heterostructures, 2D crystal layers etc.)

I want to model different 2D nano-structures, layered materials in 3D (animated version). Is there any open source where I can build these structures? ...

0

Physics Asked by ravi on 4 years ago

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