# Refraction of Light

1. Briefly describe what happens when a light ray travelling from air to a glass block that is parallel-sided (displaced laterally)?

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2. Will refraction occur when a ray of light travels perpendicular to the interface from one medium to another?

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3. Define Snell's Law

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4. Is the following formula correct when comparing velocity of light rays between 2 media: n1V1 = n2V2 ?

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5. Is it possible for a ray of light to have an angle of refraction less than 90 degrees?

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6. Define Lateral displacement

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7. Vertical displacement is the difference between real depth and apparent depth?

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8. Define absolute refractive index?

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9. Which of the following medium do you expect a greater refraction?

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10. Define critical angle

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11. Give the refractive index for a ray of light travelling from medium 1 to 2?

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12. Define the refractive index in terms of velocity

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13. Which of the following medium do you expect a weak refraction?

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14. Vacuum has a refractive index of 1?

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15. Refraction is the bending of light at the interface when it travels from one medium to another?

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16. Which of the following medium can total internal reflection occur as light is travelling?

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17. State the Law of refraction

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18. Which of the following is NOT an application of total internal reflection?

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19. What happens when light travels from a dense medium (glass) to a less dense medium (air)?

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20. Will refraction occur when the angle of incidence of the light is zero and there is no change in direction?

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21. Briefly explain what shall happen when the angle of incidence exceeds the critical angle C?

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22. What is the name given for an angle of incidence in the dense medium for which the angle of refraction in the less dense medium is 90 degrees?

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23. Can total internal reflection occur when light travels from a less dense medium to a denser medium like air to water?

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24. What happens when light travels from a dense medium (glass) to a less dense medium (air)?

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25. Define the principle of reversibility of light

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26. Refractive index of a material (in terms of real and apparent depth) is?

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27. What happens when light travels from a less dense medium (air) to a denser medium (glass)?

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28. What happens when light travels from a less dense medium (air) to a dense medium (glass)?

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29. Is it possible for a ray of light to have an angle of refraction greater than 90 degrees?

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30. Mention the 2 key main factors for total internal reflection to occur?

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31. Define the refractive index in terms of velocity for a light ray travelling from vacuum to medium?

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32. Which of the following statement is CORRECT about refraction?

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33. Mention the disadvantage to which a plane mirror has that make it not preferable for used in a periscope and other optical instrument?

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34. Light is bent as it travels from one medium to another and this bending occurs only at the interface?

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35. What is the relationship between Critical angle and refractive index?

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36. Give the refractive index (according to the principle of reversibility of light) for a light ray reversed from medium 2 to 1?

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