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` dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?

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 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 lens required for correcting (1) distant vision and (2) near vision ?

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 dioptre. What is the focal length of the lens required for correcting distant vision?

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 dioptre. What is the focal length of the lens required for correcting near vision?

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 dioptre. What is the focal length of the lens required for correcting near vision?

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 lens required for correcting(i) distant and (ii) near vision?

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 needs of power -4D for correcting his distant vision. For correcting his near vision he needs a lens of power + 1.5 D . What is focal length of the lens required for correcting? (i) Distant vision (ii) Near vision ?