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