A) angular aperture only
B) refractive index only
C) both angular aperture and refrative index
D) wave length of the light used
Correct Answer: C
Solution :
Numerical aperture is the multiple of refractive index of medium (n) and sine of angle subtended by optical axis and outer ray covered by objective\[(sin\theta ).\] numerical aperture \[(NA)=n\,\sin \theta \]
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