## Class XII Physics :: How to prepare well in advance?

Learn thoroughly the first time you learn a new concept.

Suppose, the topic Kirchhoff’s laws is taught in class. Revise the topic the same day yourselves. Keep a paper and pen while

## “One must be regular in studies” – Hindustan Times

“One must be regular in studies”Hindustan TimesIn Class XI, he found himself weak in physics, especially mechanics. “When I reached Class XII, I focused a lot on physics and made it my strength. ...

## Ms. Sumona Kumari offered merit scholarship of the Department of Science and … – India News

Ms. Sumona Kumari offered merit scholarship of the Department of Science and ...India NewsChandigarh, June 28– Ms. Sumona Kumari, a M.Sc. student of Department of Chemistry and Physics of Chaudhary Charan Singh Haryana Agricultural University ...

## What are the differences between space and vacuum?

Space relates to the three dimensional (or four dimensional or even more dimensional) region which is necessary for any object to occupy.

Vacuum denotes the absence of any matter.

## What is the force opposing gravity of earth or simply gravitational force?(We can use this to invent magic broomstick like in harry potter movies!!!..)

Gravity is the weakest force in nature but depends on the mass of the particles involved. If you use any other force (Any of the three other fundamental forces or the derivatives of them) it may be

## Why the ray of light passing through optical center of a lens passes undeviated while when it passes through other points on the interface of the lens, it gets refracted?

Deviation is the change in direction of the ray while passing through the lens. The middle portion of the lens is comparatively flat and there is a point on the principal axis and inside the sphere

## Why the ray of light passing through the centre of curvature of a concave mirror behave as normal while it doesn’t behave as normal when it passes through other points on the principal axis?

Remember that a concave mirror forms part of a hollow sphere.

Any line joining the centre of the sphere (the centre of curvature of the mirror) and any point