light and optics Flashcards
current theories about light
Wave theory of Hyguens- Compares light to sound waves.
Newton Theory of light- Light is shot out from small particles.
Quantum Theory- Light can act like a wave or a particle.
how light operates as both a particle and a wave
This theory hasn’t been proven, but light does act like a particle and a wave. Light behaves mainly like a wave but it can also be considered to consist of tiny packages of energy called photons.
examples of light & optics technologies
Microscope, Telescope, Binoculars, Glasses, Night Vision, X-rays, etc.
Light Sources
Incandescent- An object is heated to such a high temperature that it emits light.
Phosphorescent- Light energy is absorbed by [articles that can store energy for a while. This energy is then released as visible light.
Chemiluminescent- Chemical reactions produce visible light energy.
Bioluminescent- Produced in living creatures and relies on chemical reactions to produce energy of light.
Fluorescent- Particles that emit energy as light that you can see. More energy efficient.
Proton Fusion- The nuclear fusion which fuels natural light sources.
visible light spectrum
Natural light like green and yellow tell us to wake up.
Red light helps our bodies relax.
Blue light can lead to eye strain or damage, blue light from devices.
Image formation (convex lense, concave lense)
Double concave lens- Thinner in the middle and flatter in the middle than around the edges. Light rays bend outwards.
Double convex lens- thicker in the middle than around the edges. Light rays bend inwards or converge.
refraction
The bending of light from one medium to another. Light bends because it changes speeds as it goes through different densities of objects.
reflection
Strikes a surface and bounces off a surface so you can see.
Nearsightedness
When you can see near objects but you cannot see objects from a distance. This means the light forms before the retina which means the image doesn’t form on time.
Farsightedness
You can see objects from a distance, but you cannot see objects nearby. This is when the image forms behind your retina, the retina doesn’t form or catch the image.
solution for eye problems
Wear glasses, eye contacts, laser eye surgery or you can use eye drops. Use convex glasses for nearsightedness and concave glasses for farsightedness.
color blindness
The cone cells in some people’s eyes can’t detect colour which leads to colour blindness. The cone cell detects colour and the rod cells detect the amount of light entering the eye.
