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Lens Formula and Magnification

Why we use mi...

Question

Why we use minus sign in the formula of magnification of mirror?

m= -v/u

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Solution

a negative sign is used on the linear magnification equation as a reminder that all real images are inverted. If the image is virtual, the image distance will be negative, and the magnification will therefore be positive for the erect image.

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Q. Fill in the following blanks with suitable words:

(a) If the magnification has a plus sign, than image is ......... and.........
(b) If the magnification has a minus sign, than the image is ......... and .......

why is magnification in terms of mirrors -v/u whereas in lenses it is v/u ?

Q. The magnification of a lens is given by
(v = Image distance and u = Object distance as per sign convention)

Q. I want to know the reason that why we shuffle the minus sign from the denominator to the numerator

What is the formula for linear magnification for lens?

v = Image distance

u = Object distance

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