Hey all Explain the derivation of mirror formula and lense formula...
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Answer:
figure shows the ray diagram considering three rays it shows the image A'B'. of the object AB formed by a concave mirror. thus point A' image point of A if every ray originating at point A and falling on the concave mirror after reflection passes through the point A'.
A'B'F and MPF are similar.
therefore
A'B'/PM=B'F/FP. (PM=AB) ....................(1)
since < APB=A'PB'
therefore
B'A'/BA=B'P/BP. ........................(2)
comparising equation 1 &2
B'F/FP = B'P-FP/ FP= B'P/BP......................(3)
equation 3 is relation involving magnitude of distance. now we apply the sign conversion.
to reach the object AB and A'B' as well as the focus P from the pole P we have to travel the opposite to the direction of incident light.
thus B'P = -v
FP= -f
BP = -u
in equation 3 we get.
-v + f / -f = -v/-u
so 1/v + 1/ u = 1/ f
it is the mirror formula.........
and thanks mere dusre answers pr like ke liye....☺️☺️☺️☺️