IIT JEE-AIEEE 2012, Entrance Notifications, Study Tips, Engineering Preparation, Practice Test Papers, Experts Advice

Himanshu

1)If aperson is at some dist. frm a mirror of C = d and he is passing by then he can see his image upto dist. 3d

2)formation of rainbow is due to T.I.R. and refraction

3)but twinkling of stars is due to refraction only

4)moons look bigger due to optical illusion only

5)the time taken by a light ray to pass through a transparent plate of a thichness t and R. I . = # is

T = #T/C

6)in a vaccum all colours travel wid same vel. but in a medium red travels fastest

7)if we write all the colour names wid respective colours (eg. red wid red, voilet wid voilet and see it through a slab then the colour we will se as

V...........................................................................................

............I................................................................................

........................B...................................................................

....................................G........................................................

.................................................Y...........................................

..................................................................O...........................

................................................................................R.............

i.e voilet above all and red below or at bottom

8)The R.I. of a medium is independent of its frequency

9)if half of the lens is blackened the intensity of light enetering to it becomes 3/4 of original intensity

10) wen a spherical mirror is placed in water or ne other medium , its focal length remains same

hope u like that

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