Numerical Aperture

This video describes numerical aperture - a property of objective lenses that limits resolution and image brightness.

Video created by Jennifer Waters, Director of the Nikon Imaging Center at Harvard Medical School, with helpful suggestions and a cameo appearance from Talley Lambert.

[PunmasterSTP]

I came here after hearing about the high-NA EUV lithography, and this was a great explanation of the core concept. Thank you so much!

[SJMNin]

Clear explanation, simple and scientifically rigorous. Looking forward to the next video

[abinayaaaaaaaa]

Please make more such videos on basics of microscopy

[tymothylim]

Wow that is a great video :) Thanks for the great effort put in.

[livviibb]

these are such a good series of videos!

[christianforrer]

I kindly suggest you to do a video about the entrance and exit pupil, and the aperture and field stop as well, of an optical system. Might be presented in a more linear and clearer way than how I was taught those concepts in the first place.

[serdaraliandrnloglu]

For those who want to know what what is the reyleigh criterion and why is it defined like that, I suggest you to read fraunhofer diffraction chapter from the book Introduction to Optics by Frank L Pedrotti, section 11-3 Rectengular and Circular Apperatures.

[aarohimehendale]

Great lecture. Thank you! -Aarohi, Mack, and Mohammed

[dcamron]

It’s also a property optical fiber, how does the definition vary in this as compared to lens? Why doesn’t the diameter matter

[mplwgm]

Your equation for d makes it larger than the Abbe diffraction equation. According to Abbe the correct number in the numerator os 0.5 and not 0.61.

[allenshaw]

Are there any downsides to using higher numerical apertures?

[achamess]

Excellent video. Very clear and practical.

[randydaumar]

I have a probably dumb question:

Does the ocular lens have numerical aperture?

[niteshgupta]

what are photo Bleaching and Photo Toxicity that you have mentioned in your video

[GeorgeCandonly]

Don't oil an air objective.
Every month I clean at least one!