So if lense and lens is a slang term what is the real term just my
curiosity, as I have never heard of the other term to identify a
lens.
Not slang, really. More like photographer jargon. Optics designers have a different jargon; where it gets annoying is when the same words mean slightly different things. As the previous poster said, the proper technical term is "objective." (It just means a lens that's pointed at the "object." Telescopes have objectives and oculars, where the objective is in front and the ocular is at your eye. You swap the ocular to get different magnifications.)
Also I would like to know where i am throwing words carelessly, yes
I did gcse but as my own english seems to have degraded somewhat
due to multiple reasons I would like to know what is wrong with my
last statement.
What last statement? Your English usage? Nothing wrong with it for the Internet, but if you're bemoaning the degradation of the English language, I would expect you to stick to the Elements of Style rules pretty damn close. (I don't, so I don't.) For example, the above paragraph should have been written more like this:
"Moreover, I would like to know where I am using words carelessly. Yes, I did GCSE. However, since my own use of English appears to have degraded somewhat, for a variety of reasons, I would like to know what is wrong with my previous statement."
On mob rule, Christopher Columbus proved everyone was wrong when
the earth was round not flat as everybody had thought,
This is a popular misconception. It was quite widely accepted at the time (among educated circles anyway) that the world was, in fact, round. They even had the circumference pretty close to correct. The twist is that Columbus had a different theory about the circumference, which was drastically wrong: he figured that India should be about where America actually turned out to be. In other words, he had it wrong by approximately the breadth of the Pacific ocean, and then some.
this is why
going with what is right and going with the crowd has merits of
their own kind. If you still believe the earth is flat and I know
some that do I respect your thinking that primes are fixed focal
lens, otherwise if you think the earth is round you should know
better, since you are a logical person who believes in the truth
and should be consistent with that form and use the truth.
There's a pretty big difference in disagreeing about semantics and disagreeing about facts. The disagreement about what "prime" means is about semantics. The disagreement about the shape or size of the Earth is about facts.
The difference is that words mean whatever we want them to mean, as Humpty Dumpty put it, but facts are facts: we can agree that, for example, "prime" means "pink elephant," and as long as everyone is aware of the agreement, everything will be cool. However, if we should agree that the circumference of the Earth is 20,000 kilometers (without changing the definition of "kilometer,") Bad Things would happen.
Get the distinction?
"They laughed at Galilei. They laughed at Columbus. But they also laughed at Bozo the Clown."
Petteri
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