The power of spectacles lens required for a person is -5 dioptre when separation between spectacles and eye is 2 cm. What will be the power of contact lens required by him?
A. –5.25 D
B. –4.54 D
C. –3.2 D
D. –5.75 D
Answer:B
The power of spectacles lens required for a person is -5 dioptre when separation between spectacles and eye is 2 cm. What will be the power of contact lens required by him?
A. –5.25 D B. –4.54 D C. –3.2 D D. –5.75 D