New answers tagged

1

Black body radiation is the maximal possible thermal radiation ($\varepsilon = 1$). Real bodies are not perfect BBs, so the most primitive factor taking this into account is $\varepsilon \le 1$. It a factor (multiplier) at the specrtal curve.


1

I am guessing it is the emissivity https://en.wikipedia.org/wiki/Emissivity which is a factor that you multiply by the curve because things are not perfect blackbodies, depending on what the surface is made of.


0

This video by Prof. M. R. Shenoy beautifully explains everything related to resolving powers and limits of telescopes and microscopes. Your doubt is explained at around T$=20:56$ . This screenshot/diagram should clear everything up.


Top 50 recent answers are included