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formulas in optics

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Posted on
16 Apr 2007 11:09:13 IST
Posts: 3836
16 Apr 2007 11:09:13 IST
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formulas in optics
Engineering Entrance , JEE Main , JEE Advanced , Physics , Optics ,
some formulas in optics

1)
= 2pi (x) / lamda

= phase diff.  ................del. x is path diff.

2)normal shift

S = t (1 -   1/).....................( is not whole divided)

Swater = t/4

Sglass = t/3

3)wen a lens is cut into 2 = parts  perpendicular to its principal axis , focal length gets doubled and power gets halved

4)wen a lens is cut into 2 = parts parallel to its P. Axis , no change in focal length or power takes place

5)Goggles donot hav any power coz R1 = R2 = R for them

so p = ( - 1) (1/R1 - 1/R2)

6)wen a lens is submerged in a denser medium its focal length inc and power dec.

7)wen a lens is submerged in water its focal length inc by 4 times and power dec. by 4 times

8)wen a lens is submerged in a medium of greater R.I then its nature reverses

9)Min. length of a plane mirror reqired to see full image of the object of ht. 'h' is h/2

10)*  formula to calculate no. of images frmed b/w 2 mirrors is given by

n = 360/theta - 1

eg. if theta is 60.
then n = 5

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Hot goIITian

Joined: 25 Jan 2007 18:48:30 IST
Posts: 154
21 Jul 2007 18:36:29 IST
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hey himanshu.....
its a nicely composed form of optics formulae...but i think..in the 10th formulae...you must apply the condition as well...i.e if the angle
between the two mirrors is even then it is as...n = 360/theta - 1
and if the angle is odd then its like...n=360/theta.
and there is a reson behind it as well....with the even angle....we have the last image superposed at the object itself....so, we don't consider it as an object...as the image cannot be distinguished from that of the object...
rest...it seems good..
thanks...
hope this helps...and you would correct it..
keep smiling..........

Blazing goIITian

Joined: 1 May 2007 22:28:35 IST
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27 Jul 2007 23:00:00 IST
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himanshu whole day ppl thnk u and u reply back i cant imagine goiit widout u

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Joined: 19 Feb 2007 19:24:42 IST
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30 Jul 2007 01:12:32 IST
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:) :) :) :) :)
thanx fr the comment pooja :) :)

Scorching goIITian

Joined: 13 Sep 2007 13:49:46 IST
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4 Dec 2007 12:13:28 IST
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nice.....

Scorching goIITian

Joined: 15 Feb 2007 14:04:25 IST
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4 Dec 2007 20:13:04 IST
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Scorching goIITian

Joined: 27 Jul 2007 20:31:12 IST
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6 Dec 2007 12:05:41 IST
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30 nickles! ! ! ! how come so many?
may i know how many u have in total

Forum Expert
Joined: 19 Feb 2007 19:24:42 IST
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7 Jan 2008 09:36:12 IST
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498 :D :D :D :D :D

New kid on the Block

Joined: 12 Jul 2007 20:22:31 IST
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30 Jan 2008 06:59:04 IST
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hey thanx u hav done a good job.....

New kid on the Block

Joined: 29 Jan 2008 14:34:16 IST
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4 Feb 2008 22:00:53 IST
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thnx yaar!!>.

New kid on the Block

Joined: 29 Jan 2008 14:34:16 IST
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4 Feb 2008 22:07:30 IST
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gud yaar...

Cool goIITian

Joined: 31 Jul 2007 18:00:08 IST
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4 Feb 2008 22:20:14 IST
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hey please can u mention all the formulas.....these seems very less to be in number...
don't u think???

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