Ray optics, silvering of lens sign convention
I've attached the solution's sign convention method attached. But why is this the case?
39 Replies
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.i got option 3
by just substituting P_mirror = -R/2
instead of adding whatever extra minus they're pulling
whats your doubt
look at what they're doing after the "So using eq. (i)"
2pL + Pm
straight formula
maybe a coincidence, jo unhone kiya hai woh karna hai
i did that except my end result was -2/R instead of +2/R term
see the combination will act as a concave mirror
yeah
wait wait
the silvering
lemme explain myself better
i thought
so just make the image at the centre of curvature
Pm = -2/R
so i directly put that
their end result was Pm = +2/R
since concave ka focal negative hove
they put an extra minus sign and minus minus became plus
they substituted P = -1/fm = -1/(-R/2) = 2/R
i did P = 1/fm = -2/R
unfortunately, there are options to cater to both
OHH
yeah
silvering wale formule mein
we take power of converging instruments as positive
jo uska curvature hai woh left side hoga na
and diverging instruments as negetive
ye kya kyun [redacted] ye kya
calm
(jok)
sir ka server hai
since concave lens is a converging system
power will be taken as +ve
hm
reasoning?
koi hai kya
solve it without the formula
first refraction by lens
💀 👍
then reflection by lens (silvered)
then again refraction by the lens
yeah
usse hi result aaya hai ye wala
so actual formula should be P_combined = 2P_lens - P_mirror right
i assume we change the formula rather than the entire sign convention
no
Converging diverging ka jhol hai
then concave keliye galat hojaaega 🤯
usme -ve ka positive hojaaega
nawwww 😭
concavo concave
ight ight
yeah
thank u bro 👍
😼
+solved Dexter
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