Light Waves
What is all the components of the electromagnetic spectrum?
light waves, radio waves, microwaves
Which of the following statements is true about the reflection of light? There are multiple.
a. All substances absorb at least some incoming light and reflect the rest.
b. Perfect reflectors are common.
c. The manner in which light is reflected from a surface depends on the surface's smoothness.
d. No surface is a perfect reflector.
For a flat mirror, object distance (p) is always ____ image distance (q).
Equal to
A light ray very near the principal axis of the mirror.
If the distance from a light source is increased by a factor of 5, what happens to the illuminance.
Decreases by a factor of 25.
True or False
Electromagnetic waves are distinguished by their different shapes.
False it is the osculations, they are transverse waves, and perpendicular to electric and magnetic fields.
What type of light reflection occurs when light is reflected from a rough, textured surface?
Diffuse
What is the least number of rays needed to locate an image in a flat mirror?
Two
What is the difference between a real image and a virtual image?
Real images can be displayed on a surface and virtual images cannot.
If a light ray strikes a flat mirror at an angle or 29 degrees what will the reflected ray be?
29 degrees from the normal.
What is the value for the speed of light?
3.00 x 108 m/s
How many directions is light reflected from a smooth surface?
One
What type of image is produced by an object that is far from a concave spherical mirror?
smaller and upside down.
An object is located in front of a concave spherical mirror between the center of curvature (c) and the focal point (F). Where is the image located?
beyond the center of curvature
A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How far from the mirror is the corresponding object?
15 cm
1/p+1/q = 1/f
1/30 + 1/q = 1/10
With the wave speed equation what is always constant is a vacuum?
The speed of light.
According to the law of reflection, the angle of incidence is ______ the angle of reflection.
Equal to
For a spherical mirror, the focal length is equal to _____ the radius of curvature of the mirror.
On-Half (The radius)
What type of mirror is used whenever a magnified image of an object is needed?
convex mirror
What is the frequency of an infrared wave whose wavelength is 650 um.
4.6 x 1011 Hz
speed of light c = frequency f * wavelength h
3.00 x 108 = f (6.5 x 10-4 m)
What is used in order to predict the location of an image?
simple geometry, the law of reflection, and ray diagrams
For a spherical mirrors, how many references rays are used to find the image point?
Three
Describe an image produced by a flat mirror.
Same size as the object, virtual, upright, and magnification equal to one.
A concave spherical mirror has a focal length of 20.0 cm. Locate the image of a pen that is placed upright 50.0 cm from the mirror.
33.3 cm Use the mirror equation.