Derive lens formula for convex lens. What do you mean by magnification. Can you increase it? if yes, how? Also explain the concept of refractive index.

Dear Anil,

Let AB represent an object placed at right angles to the principal axis at a distance greater than the focal length f of the convex lens. The image A¹B¹ is formed beyond 2F₂ and is real and inverted.

OA = Object distance = u

OA¹ = Image distance = v

OF₂ = Focal length = f

OAB and OA¹B¹ are similar

But we know that OC = AB

 the above equation can be written as

From equation (1) and (2), we get

Dividing equation (3) throughout by uvf

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