why is f=R here? i knew that f=R/2 ? huh?

I didn't quite understand what is happening here.
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@Gyro Gearloose
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trin
trin9mo ago
from the lens makers formula
trin
trin9mo ago
if you apply this you'll get f= 20 cm
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.shadow
.shadowOP9mo ago
Ooo! It's a lens so thats why f=r/2 is not applicable instead this formula aight aight, thank you ❤️ +solved @trin
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