Nuclear Reactor

Video and Theory on Ray Tracing

This video shows the rays wch are used in drawing the ray diagrams for the lenses. Infact this video uses three rays to help us locate the image with the help of the ray diagram:

(i) One wch travels parallel to the pricipal axis after refraction passes through the principal focus,

(ii) One wch travels thru the optical center goes undeviated, and

(iii) Ray passing thru principal focus after refraction goes parallel to the principal axis.

Aid to ur memory (P, C, F)

This particular video shows the rays used for image location in case of concave lenses, still they are the same P, C and F.

But in fact in real practise I always prefer to use the first two rays for locating any image :)

The different image located for different position of the object is shown below: (Probably this u all hav done at class Xth level)....

But just for ur revision I discuss in the class....

Types of Lenses

This video discuss about the type of the lenses tht has been taught to you earlier in the class comprehend this video with the notes...

Video on Factors affecting a Parallel Plate Capacitor

This video in particular explains about the factors wch effects the capacitance of the capacitor, namely the area of the plates, distance between the plates and the nature of the medium separating the plates.
I'm also impressed about the type of parallel plate being used in this video. In most of the text bk example and numerical we just focus and talk about the parallel plate being rectangular but infact they can be of any geometrical shape, in this particular example a circular shaped plates are being used, but can be some other planar shaped also. This idea can be used in framing numericals. Just remember the formula for the area of the shape given. In this case its being circular hence area (A=pi.r^2), rest formula for the capacitance remains the same.

Video on Capacitance Variation with distance

Another video wch shows the variation in the capacitance of capacitor with distance