What type of mirror is used when we discovered the law of reflection?
A plane mirror.
200
What are the 4 properties of light?
Light travels in straight lines.
Light can be reflected.
Light can be bent.
Light is a form of energy.
200
What makes phosphorescent different than fluorescent?
A longer time period of light emission.
200
What creates a mirage?
Light bends upward when it goes from a cooler air mass (more dense) to a warmer air mass (less dense) at the ground causing an image of the sky.
200
What part of an incadescent light bulb releases 5% light and 95% heat?
The filament
200
What type of image is formed in a convex mirror? Give an example of a use of a convex mirror.
A convex mirror gives a smaller and farther away image.
Examples are store surveillance mirror, disco ball, car mirror.
300
Describe the Law of Reflection for specular and diffuse reflections.
In specular reflection all the lines of normal point in the same direction giving the same angle of reflection.
In diffuse reflection, all the incident rays are all in the same direction, but the lines of normal are at different angles causing different angles of reflection.
300
What does intensity determine?
How much energy is absorbed on a surface.
300
When the angle of incidence increase the angle of refraction....
increases but the angle dependent on the type of material.
300
How much would it cost for 60W bulb to be on for 10 hours at 8 cents/kwh?
4.8 cents
300
What shot in pool relates to the law of reflection?How?
A bank shot. The ball is hit off of the rail into the pocket. The angle that is reflected off the rail is equal to the angle that it comes to the rail.
400
What is the law of reflection?
The angle of reflection is equal to the angle of incidence.
400
What is Chemiluminescent? Give an example.
A source of light from a chemical reaction. An example is a glow stick.
400
Explain why you can see a penny in the pie plate after water has been added.
The penny position is "moved" when light enters the water and bends at an angle, creating the image of the penny in a place where you can see it.
400
How does light react to an opaque object?
It reflects or absorbs all light rays.
400
Describe and give an example of a virtual image.
Virtual image is an image located where reflected rays only seem to originate.
A concave mirror reflecting a light bulb into an empty light socket.
500
What are the laws of refraction?
Light that moves at an angle from a less dense medium to a more dense medium bends toward the normal.
Light that moves at an angle from a more dense medium to a less dense medium bends away from the normal.
Light that moves straight on from one medium to another medium does not bend, it is not refracted.
500
What is the energy pathway for a fluorescent source?
UV light energy is absorbed by particles, which then emit visible light energy
500
Draw a diagram of the Law of Refraction.
Include the incident ray, the refracted ray, angle of incidence, angle of refraction, the normal and substance of 2 different densities.
500
What is the difference between transparent and translucent?
Transparent is a clear substance that lets all light rays pass through. Transparent allows you to see a clear image.
Translucent is a a non-clear substance that allows some light to pass through but scatters some light rays. Translucent does not allow you to see a clear image.
500
Draw a diagram of a reflected ray.
Include incident ray, reflected ray, reflecting surface, normal, angle of incidence, angle of reflection.