The power of combination of three lenses is +2.25D . If individual powers of two lenses is + 0.25D and +2.75D, what is the third lens?
Answers
Answer:
>>>> The two-lens system means that your eye care professional will have specified one eye as "Dominant" on your contact lens prescription. Typically indicated by a "D" whereas the non-dominant eye is marked with an "N".
Explanation:
Your optician will try and match the curve of your contact lens to the curve of your eye to find the best fitted contact lens for you. ... Power (pwr) / Sphere (sph) / Dioptre (D): This value is the power of the lens needed to correct your long or short-sightedness and is measured in Dioptres (D).
Answer:
-0.75 D
Explanation:
The power of combination is defined as the sum of power of lenses.
Given that power of combination is 2.25D. Power of combination of one lens is 0.25D and second lens is 2.75D.
Assume that the power of combination of third lens is (x) D.
Power combination = power (one lens + second lens + third lens)
Substitute the values,
2.25 = 0.25 + 2.75 + x
2.25 = 3 + x
2.25 - 3 = x
- 0.75 = x
Hence, the power of combination of third lens is -0.75 D.