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Physics
Physics
Problem
If two structure of same cross-sectional area, but different numerical apertures
N
A
1
NA_1
N
A
1
and
N
A
2
NA_2
N
A
2
(
N
A
2
<
N
A
1
NA_2 < NA_1
N
A
2
<
N
A
1
) are joined longitudinally, the numerical aperture of the combined structure is a.
N
A
1
N
A
2
N
A
1
+
N
A
2
\frac{NA_1 NA_2}{NA_1 + NA_2}
N
A
1
+
N
A
2
N
A
1
N
A
2
b.
N
A
1
+
N
A
2
NA_1 + NA_2
N
A
1
+
N
A
2
c.
N
A
1
NA_1
N
A
1
d.
N
A
2
NA_2
N
A
2
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