8. Solve the following examples.
i. Doctor has prescribed a lens having
power +1.5 D. What will be the focal
length of the lens? What is the type
of the lens and what must be the
defect of vision?
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Answer u asked is given below plz fllw back
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Answer:
+0.67m, farsightedness
Explanation:
Given :
Power of lens, P = +1.5D
Now, focal length of lens,
1 1
f = __ = __ = + 0.67
p 1.5
Since, the focal length is positive, the lens prescribed for correction is convex lens. Thus, the defect of vision is farsightedness or hypermetropia.
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