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Discussion Response Post to: refraction

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17 Aug 2007 22:31:10 IST

Subject: Re:refraction

swashata4iit (880)

Blazing goIITian

156 [206 rates]

total posts: 456
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Hey this is quite simple:

Use the formula f = (D² - x²)/4D ...........(1)

Where D = distance between obj and screen
x = shift of the lens by trial method. here x = 10^{[ ]}

17
          f = focul length of the lens = 40 cm

    Solve the eqn (1) and you will get two value of D: 170 and -10.
    The -ve value is rejected by physics and hence the answer is 170 cm

Remember this process can only be used if real image is formed by the lens.
For the proof refer ur text book

Whenever u feel bad go for math
if u feel too bad
imagine your rival competeing u
U will be energetic like never before

this reply: 10 points (with 2 Olaaa!! Perrrfect answer.

in 2 votes ) [?]

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