A point object O is placed on the principal axis of a convex lens of focal length $$20cm$$ at a distance of $$40cm$$ to the left of it. The diameter of the lens is $$10cm$$. if the eye is placed $$60cm$$ to the right of the lens at a distance h below the principal axis, then the maximum value of h to see the image will be

Question

A point object O is  placed on the principal axis of a convex lens of focal length $$20cm$$ at a  distance of $$40cm$$ to the left of it. The diameter of the lens is $$10cm$$. if the  eye is placed $$60cm$$ to the right of the lens at a distance h below the principal  axis, then the maximum value of h to see the image will be

Infinity Learn · Accepted Answer

$$1f=1v-1u$$ $$120=1v-1-40$$ $$v=40cm$$                   $$h20=540=18Or$$ $$h=208cm=52cm=2.5cm$$

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