Question

When a lens of focal length f is cut in to two equal halves perpendicular to principle axis, then each part of the lens has a focal lengh.
a) f
b) 2f
c) f/2
d) f/4 ​

Answer 1

Answer:

c) f/2 ( this is the correct answer from Google )

Explanation:

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Answer 2

Answer:

2f

Explanation:

The lenses have 2 principal focuses.

When a lense of "f" focal length is cut perpendicular to the principal axis, then each half will have f1 and f2 each respectively, as it's focal length

When the lens is cut perpendicular to the principal axis, the focal length is twice the original.