Recent content by canoluk2003

Hi all! In questions having implicit functions, this expression -> "d/dx y^2" often appears in the calculation process. I use the chain rule to convert it to 2y x dy/dx But why can the chain rule be used here? I actually don't understand at all.. Any help is appreciated. Thanks guys!

Hi man, thanks for the reply. I still can't draw the ray diagram u have mentioned.. Mind giving some help? ; (

Lens problem! Hi guys, When an object is placed in front of a convex lens ( not between Focus and optical centre ), the image formed on the other side should be inverted and real. My question is, with the mentioned placement of the object, will the image be laterally inverted? Further more...

thx dude! i was really confused with the word "infinite" haha

So...(don't quite understand), is the "infinity" mentioned in my textbook away from the fixed charge or very near to the fixed charge? Can you explain in a simpler way? :D Thx!

Hi guys, have some problem with Electrical PE. My textbook said sth like this " for the electric field produced by a point charge, we usually choose the energy at infinity to be zero" What does that mean? What is "energy at infinity"? Thx!