Download Application of Light Review

Physical Science 20 - Light Review
Part A: Topics
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Two theories of light
o as a wave
o as a particle
Speed of light (equation)
Electromagnetic Spectrum
Absolute and Relative index of refraction
Snell’s Law
Methods of Bending light: Reflection,
Refraction, Dispersion, and Scattering
Total Internal Reflection
Critical angle
Applications of light
Absorption and emission
Sources of Light
Transmission and Absorption of Light
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Lateral Inversion
Reflection of Light: specular, diffuse and
retro-reflectors
Location of image – point and extended
Line of sight
How an image is seen
Characteristics of images
Ray tracing curved mirrors – 7 Cases
Ray tracing thin lenses – 6 Cases
Sign conventions for lenses
Mirror and thin lens equations
Spherical Aberration
Chromatic Aberration
Polarization
Part B: Questions:
1. Name the parts of the electromagnetic spectrum in order from longest to shortest wavelength. Name at least
two practical applications for each part of the spectrum. Which form of light is the least dangerous? Which is
the most dangerous?
2. Discuss one application of each part of the EM spectrum that applies to astrophysics.
3. State the two laws of refraction
4. How far away is 17 light years in meters?
5. Calculate the absolute refractive index for a transparent plastic material, if the speed of light in the plastic is
2.5 x 108 m/s.
6. A ray of light in air has an incident angle of 40.8° on the surface of the same plastic used in the last question.
Determine the angle of refraction in the plastic.
7. As a ray of light passes from air into ruby, it enters with a refracted angle of 22°. What is the angle of incidence?
8. Calculate the relative index of refraction, and explains what happens to light between:
a. Sodium chloride and zircon
b. Flint glass and quartz
c. Having an incident angle of 15° in one medium and refracted angle 36° in the other.
d. Having an incident angle of 63° in one medium and refracted angle 51° in the other.
9. Find the critical angle for light going from:
a. Zircon to crystal glass
b. Crown glass to glycerine
c. If the angle of incidence for each of the above is 60°, does the light ray reflect or refract?
d. Air to water
10. Draw sketches showing how a beam of light reflects off a smooth surface and off a rough surface. Label the
sketches completely and give the name of each form of reflection shown.
11. Be able to locate the image of an object located in front of flat mirrors. BRING A PROTRACTOR!!!
12. Be able to find the line of sight to determine the location of images in flat mirrors.
13. Be able to ray trace the objects in front of curved mirrors and lenses.
14. A concave mirror has a focal length of 10.0 cm. If a 4.0 cm high object is placed 15.0 cm from the mirror, where
does the image form and how high is it?
15. A convex mirror’s radius of curvature is 40.0 cm. If an image formed 10.0 cm behind it:
a. What is the focal length of the mirror?
b. Where was the object?
c. If this object was 25.0 cm tall, how high is the image?
16. An object placed 40.0 cm in front of a mirror formed an 8.0 cm high image 10.0 cm in front of the mirror.
a. What kind of mirror must it be, and how do you know?
b. Is the image upright or inverted and how do you know?
c. Calculate the focal length of the mirror.
d. Calculate the height of the object.
17. A concave mirror with a focal length of 45.0 cm has an object 30.0 cm in front of it. Calculate the image location
and the magnification factor.
18. A certain mirror has a magnification factor of +0.5.
a. Is the image upright or inverted?
b. Is the image larger or smaller than the object?
19. An object placed 32 cm from a lens produces an image 18 cm from the lens on the object side.
a. What is the focal length of the lens?
b. Is the lens concave or convex and how do you know?
c. Is the image real or virtual and how do you know?
d. If the object was 42.8 cm tall, how tall is the image?
20. A lens whose focal length is 49 cm produces a real image 83.5 cm from the lens.
a. Is the lens concave or convex and how do you know?
b. How far from the lens was the object?
c. If the object is 60.4 cm tall, how tall is the image?
d. Is the image upright or inverted and how do you know?
21. Review all your theory (see all the notes online).