Question

bi-focal lens is made up of with _______ lens.

1) Concave

2) Convex

3) Both 1 & 2

4) Plano-convex

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Answer 1

Answer:

3) both 1 and 2.....

A bi focal lens means that it has two different focal lengths and this can be only possible when there are two different types of lens are joined together to make into one....

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Answer 2

Answer:

convex lens

Explanation:

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