Physics · Ray Optics
The numerical aperture (NA) of a microscope objective in a medium of refractive index μ and semi-vertical angle i is given by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1sin-1(i / μ)
- 2sin(i) / μ
- 3μ sin(i)✓
- 4μ / sin(i)
Correct answer
μ sin(i)
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