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(a) A nearsighted person cannot clearly see beyond 200 cm . Find the power of the lens needed to see objectes at large distances. (b) A farsighted person cannot see objects placed closer to 50cm . Find the power of the lens needed to see the objets at 20cm . (c) A person wears glasses of power -2.5 D . Is the person farsighted or nearsighted? What is the far point of the person without the glasses?

A person wears glasses of power -2.5 D . Is the person short sighted or long sighted ? What is the far point of the person without glasses ?

A person wears glasses of power - 2.5 D . Is the person short sighted or long sighted ? What is the far point of the person without glasses ?

A person wears glasses with power -2.5 D. Without glasses the person

A person wears glasses of power -2.5D . The defect of the eye and the far point of the person without the glasses are, respectively

A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision, he needs a lens of power + 1.5 dioptres. What is the focal length of the required for correcting (i) distant vision, and (ii) near vision ?