What kind of sign convention must be used for the calculations of spherical mirrors & lenses? As we know there are alot of disagreements & misconceptions in the case of texbooks & teachers FOR THE USAGE OF sign convention ! Some of them use what's called "New Cartesian sign convention", while others use another different way than that ! So, whats the real fact ?? You know even the teachers in YouTube disagreed this issue !!!
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in the direction of incident ray +ve
opposite to the direction of incident ray -ve
upside of pricipal axis +ve and downside -ve .
hope it help u
Heymanthemac:
Thanks, but I would like to ask you a further details about the topic please:
Now you provided an answer, what would you certify or verify the reality of your answer please? Can you came up with a proof?? What do you say about the other teachers that ideologically different from you?? Are they mistakenly explained?? Give me please if you have a rilable fact for this operation.
actually , i paased my 12th. i always used the same conventions. it really helped.
in the answer. instead of "in direction of incident light , u can also use towards the lens or mirror as +ve and away from it as -ve "
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