A person suffering from short sight is advised to wear spectacles having concave lens of power 1.25 d. what is the farthest distance he can see clearly without spectacles
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He can see less than infinity only up to a distance of few metres(or even less).
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80 cm
here 1/f=p=1.25 ,the lens make the image such that the objects at infinity is made at the farthest distance he can see clearly without spectacles
therefore v is to be found and u=infinity
1/f=1/v-1/u
here 1/f=p=1.25 ,the lens make the image such that the objects at infinity is made at the farthest distance he can see clearly without spectacles
therefore v is to be found and u=infinity
1/f=1/v-1/u
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