Question

Write down the formulas for refractive index, magnification and lens. ​

Answer 1

It is Ratio of Height of Image to the Height of Object

Hence it gives extent image is magnified compared to image of object

Suppose Height of object is h

Height of Image is h'

Magnification is m

So

Magnification = Height of Image/ Height of Object

m = h'/h

We also have another formula for magnification in lenses

Magnification = v/u

where

v is image distance

u is object distance....

Thus,

If Virtual image is formed,v is negative

If Real Image is formed, v is positive

Object Distance (u) is always negative as it is on left side of the lens

Focal Length of Convex Lens is Positive

Focal Length of Concave Lens is Negative...

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