Two lenses A and B have a power of +2.5D and – 1.5D respectively.
a. Identify the nature of the lens A and draw a neat figure to show the lens.
b. What is the focal length of lens A?
c. What is the power of the combination of the two lenses?
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Answer:
power of the combination of the power-2
P =1/f
+1.5 D = 1/f
f = 1/1.5 = 2/3 = + 0.67 m.
The focal length is + 0.67m.
The nature of lens is converging type or convex lens.
The defect of the eye is Hyperopia or far-sightedness.