A question concerning lenses and the resulting images

  • Thread starter Thread starter gsingh2011
  • Start date Start date
  • Tags Tags
    Images Lenses
AI Thread Summary
When an object is placed infinitely far from a convex lens, the light rays become parallel, resulting in a real image forming at the focal point. In this scenario, the magnification is effectively zero, indicating that no discernible image will appear on a screen placed at the focal point. However, the result is a single point of light, influenced by the lens's aberrations. This phenomenon can be likened to observing a distant star, which appears as a point source. The discussion highlights the unique behavior of lenses in relation to distant objects and image formation.
gsingh2011
Messages
115
Reaction score
1
Imagine a situation where an object is placed infinitely far away from a convex, converging lens such that the light rays that come from the object are parallel to the principal axis. The real image forms at the focal point. In this situation, the magnification is 0, so if a screen was placed at the focal point where the image formed, would no image show up?
 
Science news on Phys.org
Yes but it would be a single point (actually the size would be set by the aberations of the lens) - think of a star
 
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...
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...
Back
Top