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Magnification

When a real i...

Question

When a real image is formed what is the sign of image distance and magnification?

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Solution

a:1:{i:0;a:4:{s:4:"html";s:23:"Welcome Student on chat";s:6:"userId";s:8:"38152631";s:7:"created";s:19:"2020-07-20 13:25:58";s:4:"flow";i:0;}}

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Q. Assertion :The minimum distance between an object and its real image formed by a convex lens is

^{'} 2 f^{'}

Reason: The distance between object and its real image is minimum when its magnification is one.

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(m = \frac{- v}{u})

?
a) Negative sign indicates image is real and inverted.
b) Positive sign indicates image is erect and virtual.
c) Positive sign indicates image is virtual.

What is meant by magnification ? Write its expression. What is its sign for the (a) real (b) virtual, image ?

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and the length of the telescope is

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