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Question

A normal human eye can see an object making an angle of 1.8 at the eye. What is the approximately height of object which can be seen by an eye placed at a distance of 1m from the object.
1075698_6208dd0bc09c4e079091ad362f1aff34.png

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Solution

Since θ is very small
tanθθ
θ=1.8×π180rad
π100rad
θ=h1,h=π100m
h=0.031m

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