Transmission, reflection, and absorbtion

AI Thread Summary
For visibility, light photons must be reflected rather than absorbed or transmitted. An object, like an apple, appears red because it reflects red wavelengths of light while absorbing others. The human eye perceives color when photons are absorbed by the retina. This absorption process is essential for visual perception. Thus, both reflection and absorption play crucial roles in how we see colors.
LogicalAcid
Messages
137
Reaction score
0
In order for us to see something, the light photon needs to be reflected, not absorbed or transmitted? Then is it that the same frequency of visible light keeps falling on something, an apple is always red in white light, why does it reflect red?
 
Science news on Phys.org
Actually, in order for us to see something, a photon has to be *absorbed*. By the retina.
 
Andy Resnick said:
Actually, in order for us to see something, a photon has to be *absorbed*. By the retina.

in the atoms pov i mean
 
Thread 'A quartet of epi-illumination methods'

Thread 'A quartet of epi-illumination methods'

Well, it took almost 20 years (!!!), but I finally obtained a set of epi-phase microscope objectives (Zeiss). The principles of epi-phase contrast is nearly identical to transillumination phase contrast, but the phase ring is a 1/8 wave retarder rather than a 1/4 wave retarder (because with epi-illumination, the light passes through the ring twice). This method was popular only for a very short period of time before epi-DIC (differential interference contrast) became widely available. So...
View full post »

Thread 'Effective absorption coefficient of gold nanoparticles'

I am currently undertaking a research internship where I am modelling the heating of silicon wafers with a 515 nm femtosecond laser. In order to increase the absorption of the laser into the oxide layer on top of the wafer it was suggested we use gold nanoparticles. I was tasked with modelling the optical properties of a 5nm gold nanoparticle, in particular the absorption cross section, using COMSOL Multiphysics. My model seems to be getting correct values for the absorption coefficient and...
View full post »

Similar threads

I Is This....Right? Splitting LED colors is not working for me
Replies
40
Views
3K
Classically, how can I explain Reflection?
Replies
4
Views
1K
Are these explanations for color/light-absorption correct?
Replies
5
Views
2K
The relationship between absorbtion, emissivity and reflection
Replies
1
Views
7K
Composition of Light: Questions & Answers
Replies
28
Views
3K
Reflection and transmission of waves in a medium of nonuniform density
Replies
10
Views
2K
How do different materials interact with light?
Replies
5
Views
3K
Optics: white object reflection properties
Replies
6
Views
2K
Why light reflected off of my calculator screen turns bluish?
Replies
3
Views
4K
Frustrated Total Internal Reflection
Replies
6
Views
2K

Hot Threads

Recent Insights

Back
Top