Physics, asked by shahh, 1 year ago

a convex mirror of focal length 30cm forms an image which is quarter of the object.What is the object distance

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Answered by chidiya92

Hope this will be helpful

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shahh: but can u plz tell me as u is negative in concave mirror why dont u took -u in mirror formula

chidiya92: I didn't understand ur question

chidiya92: object distance is negative for both concave and convex mirror.

shahh: yes if it is negative then why dont u use 1/-u in the formula

shahh: i mean u have written 1/u -4/u=1/30

shahh: so u should write 1/-u - 4/u=1/30

chidiya92: we don't use 1/-u in the formula because 'u' is not negative but the value of u is negative

chidiya92: Have u seen the cartesian plane. The y axis divides the x axis in two parts positive and negative......so just replace the y axis with mirror. And we put yhe object in the negative side. So the value of 'u' will negative rather than 'u' itself...

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