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What do you mean by linear magnification...

What do you mean by linear magnification produced by mirrors ? The power of a lens is +2.5 D . What kind of lens is it and what is its focal length ? Draw a ray diagram of an image when an object is placed on the principal axis of a convex lens between focus and optical centre.

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(i)convex lens (converging lens)
`P=+2.5 D, " " f=1/P =1/(2.5 m) =(100xx10)/2.5 =+40 cm `
(ii) When an object is placed between focus and optical centre of the convex lens then the image will be virtual, magnified, erect.
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