What is the value of least distance of distinct vision iof a healthy human being ?
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25 cm from eye is the least distance of distinct vision of a healthy human being....
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The ratio of the size of the image to the size of the object is called "Magnification". It is denoted by M.
\fn_cm {\color{DarkGreen} M=\frac{I}{O}=\frac{q}{p}}
where,
I = Image Size
O = Object Size
p = Distance of object from the lens or mirror
q = Distance of image from the lens or mirror
Derivation for the Above Equation
When an object is placed in front of a convex lens at a point beyond its focus, a real and inverted image of the object is formed as shown in the figure:
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