quasar
Concave mirrors used to focus light on a point, such as in a solar collector, would be in the shape of either a Hyperbolic or Parabolic section. The reason for the xxxxbolic section is that they both have focal points (foci?). any light coming into the mirror at any angle is reflected to this focal point. Think of using a magnifying glass to burn ants... you need to move the glass higher or lower to the ground until you get that bright dot of concentrated light/heat and then you can burn ants. The small white dot of light/heat is the focal point of you magnifying glass. Hope that helps..
It is called a diaphram.
Much of the area under a magnifying glass will be far colder than the area not covered by it. Only a small point or area will be hot, and much hotter at that. This is because the light striking the glass is refracted and focused toward a point of convergence. The result is that our small place gets much hotter - as it receives all of the light concentrated - and the rest gets colder - because it isn't receiving any direct light.
There still there you can't see it because the star is a sun and in light you cant see a small peace of sun so its still there but you can't see it.
No. A laser is a bean of light that propagates in one direction with little spread and generate light only over a very small range of wavelengths. The rays of sunlight are parallel only because of our great distance from the sun. Sunlight can be focused to a point using mirrors or lenses, but will spread out beyond that point, rather than as a coherent beam light a laser. Additionally, sunlight consists of the entire spectrum of light.
It could be a star, a galaxy, a quasar.
It is when you are senitive to bright light making your pupils become very small as they absorb too much of the light. The eyes water and burn slightly when in bright light
Commonly called a shooting star.
a star
A visible psi ballA spiritA light bulb
because they have very very small eyes
You can not collect light.
Kayak
if you mean the small shadow, its the penumbra
Visible light spectrum.
She called her first aircraft 'Canary' as it was small and bright yellow.
it is called a photon