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Q.

Which of the following is correct for bifocal spectacles?


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a

Concave lens : upper part and  Convex lens : lower part 

b

Concave lens : lower part and  Convex lens : upper part 

c

Concave lens : lower and upper part  and  Convex lens : middle part

d

None of the above  

answer is A.

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Detailed Solution

Bifocal spectacles have concave lens on the upper part and convex lens on the lower part.
Bifocal spectacles contain a combination of two lenses. It is used when our eye loses the ability to focus by itself. In bifocal spectacles, a concave lens is used in the upper part, and a convex lens is used in the lower part.
 
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Which of the following is correct for bifocal spectacles?