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Cool goIITian

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2 Oct 2008 17:28:28 IST

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Hcv question

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Question no. 13 page 413 geometrical optics.

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vignesh the cooler version of newton

Blazing goIITian

Joined: 16 Mar 2008

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2 Oct 2008 17:49:31 IST

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can you plzz tell me the question..

boredom

Blazing goIITian

Joined: 14 Jan 2007

Posts: 602

2 Oct 2008 17:50:59 IST

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Let distance between S and M2 be 'd' so that total distance is 30+d.

Now,for M2- f=20

u=-d=>v=20d/(20+d) to the right of M2

Therefore,

for M1, since image formed at S itself,

u= -((30+d)+ 20d/(20+d))

distance

from M1

to M2

v=-30

f=-20

Therefore,

d²+ 10d-600=0=>d=20=>distance = 50cm

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