A person wears eye glasses with a power of `-5.5 D` for distance viewing. His doctor prescribes a correction of `+ 1.5 D` for his near vision. What is the focal length of the lens used for correcting (i) distant vision and (ii) near vision?

A person wears eye glasses with a power of - 5.5 D for distance viewing. His doctor prescribes a correction of + 1.5 D for his near vision. What is the focal length of his distance viewing part of the lens and also for near vision section of the lens ?

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

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

A short sighted person is wearing specs of power -3.5 D . His doctor prescribes a correction of + 2.5 D for his near vision. What is focal length of his distance viewing part and near vision. What is focal length of his distance viewing part and near vision part ?

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 ?

A doctor prescribes a person (i) power of -5 D for distant vision correction (ii) power of +2 D for near vision. Determine the focal length of both the parts of corrective lens.