Optics exam questions (12 A)

  You will write the text next week on 9th of December.

Colors

1.  How can the white light be splitted into the colors?
2. Why is the sky lue and why are the clouds white?
3. What are the basic colors?
4. What are the complementary colors of the basic colors?

 Mirrors

1. Do you et the same picture if you use a plane mirror? 
2. How does a periscope look like?
3. Draw a convex and a concave mirror. Where is the focal point of these mirrors?
4. What happenes if parallel beam of ligth falls on convex or on concave mirror?
5. For what can a convex or a concave mirror be used?
6. Draw a diverging and a converding mirror.
7. What kind of mirror can be used for headlight, shop security mirror, make-up mirror, satelitte dish?
8. What kind of picture do you get if the objects is between the focal poitn and the mirror in case of a concave mirror?
9. How can you get diminished, magnified, real , virtual, upright and upsie down pictures?
10. How can you get diminished and upright picture?
11. How can you get same size and virtual picture?

Lenses

1. What is the problem in case of long sighting and how can you corect it?
2. What is the problem with short sight eye and how can it be corrected?
3. Draw a diverging and converging lens.
4. What kind of pictures can you get using a converging lens depending of the distance of the object from the mirror?
5. What kind of pictures can you get using adiverging lens depending of the distance of the object from the mirror?
6. For what can a convex and a convcave lens be used? 
7. How can you get diminished, magnified, real , virtual, upright and upsie down pictures?
8. How can you get diminished and upright picture?
9. How can you get same size and virtual picture?

Total reflection

1. For what can be used the fibre optics?
2. How does the optics fibre work?
3. Why is good to make the fibre thinner?
4. Whne was the FO invented?

Laser

1. What is a short form of laser?
2. Why is laser special?
3. For what can it be used?

Refraction

1. How much is the speed of light in vacuum?
2. Is the speed of light the same in water or in glasss?
3. What happens if the light goes from water to air and what happens in the opposite case?

You the bending light phet simulation

1. How does the speed change if the refraction index increases?
2. The rfraction index in the first medium is 1,2 and in the second one 1,4. The angle of incident is 30 degree. What will be the angle of refraction?
3. Which medium is more dense?
4. What is the speed of light in the first and in the second medium?
5. What is the angle of total internal refraction in this case?

Calculations

Snell's law

Snell's law states that the ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of phase velocities in the two media, or equivalent to the opposite ratio of the indices of refraction.

Mirror and lenses equation

 The mirror equation expresses the quantitative relationship between the object distance (d_o), the image distance (d_i), and the focal length (f)


Pictures

What can you see on this picture?

 


What kind of lens is used in a camera? And why?











What kind of mirro can you see on this picture? Draw a ray diagram in your exercisebook to show that the picture is really diminished and upright.

 


Phet

You ahev to use this simulation . http://phet.colorado.edu/sims/geometric-optics/geometric-optics_en.html

The object is 100 cm from a converging mirror. By the help of this simulation you have to answer the following questions.

1. Where will the image appear?
2. How will the image look?
3. If the lens is made fatter in the middle, how will the image change?

Answer the same questions if the lens is not concave but convex.




Videos

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