Characteristics of Light
Contains 1 _____ field and 1 _____ field that flow perpedicular to each other
Magnetic/Electronic
What waves has the highest energy?
Gamma ray.
What happens during reflection?
Light waves bounce off of a surface and reflect in the opposite direction (on a smooth surface) or go in random directions (rough surface)
What are the 3 types of properties of light?
Refraction, Absorption, Reflection
What are the 8 parts of the eye?
1. Cornea
2. Pupil
3. Lens
4. Retina
5. Optic Nerve
6. Iris
7. Vitreous
8. Ciliary Muscle
Do these waves require a medium. (Full answer required)
No, but the light waves can use a medium. ex. prisms, mirrors, and lenses.
*This is shown as absorption, reflection, and refraction.
What is a Radar and what does it stand for?
A radar is a device or system of a transmitter that emits radio waves and contains a reciever that processes their reflections.
Radio Detection and Ranging
What happens during refraction and how does it affect wave speed?
Waves bend as they transition into a different medium. The speed changes since different mediums affect speed.
What are particles moving at the speed of light?
How do you fix nearsightedness?
Use a concave lens.
The ability to think of light waves as ____ and ____ is called "the dual nature of light"
Waves/Particles
What is modulation?
The process of varying radio waves.
Name all 2 lens types and all 3 mirror types.
Mirrors: Plane/Flat, Concave, & Convex
Lens: Concave & Convex
What is fiber optics?
Fiber optics is whenever photons travel through a cable. The angle of incidence is kept large to insure total internal reflection.
How do you fix farsightedness?
Use a convex lens.
Name the order of states of matter (vacuum included) that light travels through from fastest to slowest.
Vacuum, gas, liquid, solid.
Name all parts of the electromagnetic spectrum in order from longest wavelength to shortest.
Radio waves, micro waves, infrared waves, visible light, UV radiation, X Rays, gamma rays.
What is a prism and how does it create rainbows?
A prism is a trasnparent object (often a triangle) with 2 or more plane surfaces. It creates rainbows through dispersion. Dispersion is the splitting of white light into the individual colors.
What are the 2 way fiber optics are mainly used?
Telecommunications and decorative fixtures.
Why do you use convex for farsighted vision and concave lens for nearsighted?
Convex lenses bring light together and since farsightedness is caused by light being focused behind the retina.
Concave lenses spread light out and since nearsightedness is caused by light being too focused at the front of the retina.
Name 2 relationships between light waves and wave parts.
Energy is directly proportional to the frequency
Brightness (intensity) is directly proportional to the amplitude of a wave
Velocity is constant, so frequency and wavelength have an inversely proportional relationship
Give an example of all wave types IN ORDER
Infrared Radiation- the part of sunlight that feels warm, thermograms, shows heat loss in homes, can see humans and animals in total darkness
Visible Light-ROYGBIV
UV Radiation-Tanning beds
X-Rays-Imaging for medical purposes (x-rays) or security
Gamma Rays- radiotherapy is made of these waves, and this is used to kill cancerous cells.
What is the difference between a convex and concave lens/ mirror?
Convex Mirrors diverge light making the image right side up and smaller.
Concave Lens diverge light making the image right side up and smaller.
Convex Lens converges light making the image right side up and magnified when close, but upside down and smaller when far
Concave Mirror converges light making the image right side up and magnified when close, but upside down and smaller when far