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The lens must be a convex lens. The object is at focus.

\[1/v - 1/u = 1/f\]

Here, v = 0

Also, m = v/u

But, I am not getting the answer.

put down the ray diagram for me when image is at infinity for convex lens

Just one minute. Here is the diagram.

|dw:1333555806014:dw|

yeah so? u=?

object disatnce=?

u = 5

then? tell me how do i proceed?

m = f/(f+u) = 5/(5+5) = 0.5?????

m=v/u u never used taht?

But how to do? Please say in detail the complete steps.

u know that formula?

U say akka. PLease.

i forgot for lenses tahts y ia m asking u

Ohhhhhhh!!! Can u please post the details tomorrow? I have to go now. Bye.

ok bye! see pg.182 of 10th ncert text book

Okay, will look and say tomorrow.

Its given that, m = v/u = h1 / h2

But, v = 0 na?

1/f=1v-1/u
1/v=1/f+1/u
by sign convention
f=-5
u=-5

v=?

v = 0, rite?

U learnt ssign convention?>

yeah. U try and see. This problem uses some different formula. Then only we can get it.

i will get back to you later after searching abt this problem

OK.

U r correct didi!!!!!! Cheers!!!!!!! thanks for the solution.

:) we learn nothing...........there is so much to learn further

!!!!!!!!!!!!!!!!!! i dont know wat to type
:)

Hehehehheheheheh!!!!!!!!!! Crazy Sister!!!!!!!!!!!!!

Can't stop laughing!!!!!!!!!!!!!!!!!!!!