Give whether each of the following statements are true or false. 1. Reflection i

Question

Give whether each of the following statements are true or false.

1. Reflection is the description of the portion of a ray of light that remains in the medium from which it originated after striking the boundary of a different medium.

2. Refraction refers to the change in direction of the ray of light entering a new medium.

3. The angle of incidence equals the angle of refraction.

4. Angles in optics are measured with respect to the surface.

5. The intensity of the reflected beam is greater than the intensity of the incident beam.

6. The intensity of the refracted beam is always less than the intensity of the incident beam.

7. Light travels at a faster speed in a vacuum than it does in a medium.

8. Light refracts through air even though the index of refraction is 1.000.

9. The higher the index of refraction of a medium, the slower light moves within it.

10. The index of refraction of most materials depends on the wavelength of the light going through it.

11. In going from air into most materials at the same angle, a blue beam of light deviates more from its original direction than an orange beam.

12. In going from air into most materials at the same angle,  longer wavelength light refracts more than shorter wavelength light.

13. It is possible for a material to have a negative refractive index.

14. Snell’s Law gives the change in intensity of a beam of light when it travels from one medium to another.

15. Dispersion is the phenomenon of different colors having different indices of refraction in a material.

Explanation / Answer

1. false

2. true

3. false (angle of incidence=angle of reflection)

4. false (with respect to the normal to the surface)

5. false

6. true (there is a seemingly exception: in the case of the total internal reflection, when the wave returns in the initial medium. But there is the evanescent wave, which 'takes' from the initial intensity. So, even in this case, the intensity of the refracted wave is not the same with that of the initial wave)

7. true

8. true (air may have different layers whose indices of refraction vary from one to another)

9. true

10. It's a wrong/incomplete formulation: the wavelength of a wave in a certain medium depends on the index of refraction of that medium. Conversely it's also true, but only from a certain speed of wave up.

11. true

12 false (blue wavelengths refract more)

13. true

14. false

15. true (Not really "colors", rather wavelength/frequencies. They are related, of course, but in this case we're talking about the parameters expressing the color.)

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