how tto prepare from home as to secure good rank in iit jee 2012

Hi,

For 2012 you can prepare coz u have got time, i ll advise u to alweys revise the material after coming back from school or tutions ... it wont take much time but it helps alot in remembering things for long time. This is very right time when a student can make a base for the future..divide your time for chemistry, maths and physics acc to yourself and practise alot...Preparing from home is good all u hv to study is own ur own but wll suggest you to join some coaching coz thru coaching you ll get the direction and proper guidelines ...

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Regards,
Askiitians Expert
Amit - IT BHU

Can you suggest me time management for preparing for IIT - JEE?

Good Morning Sir,

all about ,,,,

Circular Refraction: At the surface of some planets because of radial change in the RI of air(variation of RI with altitude) the horizontal light beam bends in such a way that it circularly envelops the planet. This situation is called circular refraction.If the radius of the planet be R Then .......

1/R+h = -dmu/mu*dh  how this expression came??

plz elaborate it wid example