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Biology; Chemistry; Physics: Post your doubts here!

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Who is better to get Physics classes at GreenHall ? Sir Shakeel Ahmed or Sir Azhar Mahmood? I have no idea how to choose and who is better since I havent studied from both or one of them and neither have my friends.
 
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Anyone kindly answer the attached three questions asap. Thanks.
 

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Does anyone have Cambridge O level Physics by David Sang & Graham Jones teachers resource CD or answer to the chapter end questions? plzzz help me
 
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asslamoalaikum sir.how r u?sir can u please send me a link in which there are may June past paper questions of physics,chemistry and biology.would help me very much
 
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This might be a little of topic but plz I want to know how to study for Physics. I get excellent marks in bio and chem but seriously I won't get good marks in phy no matter what I do... Can anyone help me.
 
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Can anyone tell what exactly is 'refractive index' ? Besides the formula please...

It is the property of an optical medium which causes light to refract upon entering it, it is given by the ratio sin of angle i and the sin of angle r in the optical medium.
 
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