Refraction

9.The 'bent pencil' illusion when a pencil is partially submerged in water is caused by:

10.Which of the following increases when light enters a medium with a higher refractive index?

11.When light travels from glass into air, what happens to the angle of refraction compared to the angle of incidence?

12.A ray of light passes from air into a glass block. The angle of incidence is 40°. What is the angle of refraction?

13.A ray of light passes from air into a glass block. The angle of incidence is 45°. Which of the following is the most likely angle of refraction?

14.A student measures the angle of incidence and angle of refraction for light entering a glass block. The results are: i = 0°, r = 0°; i = 20°, r = 13°; i = 40°, r = 25°; i = 60°, r = 35°. What happens to the angle of refraction as the angle of incidence increases?

15.A ray of light passes from glass into air. The angle of incidence in the glass is 30°. What can you say about the angle of refraction in air?

16.What happens to the speed of light when it enters a medium with a higher refractive index?

17.The speed of light in a vacuum is 300,000,000 m/s. In a certain type of glass, the speed is 200,000,000 m/s. What is the refractive index of this glass? (Refractive index = speed in vacuum / speed in medium)

18.Which of the following properties of light does NOT change when it refracts from air into glass?

19.A ray of light enters a glass block at an angle of incidence of 0°. What happens to the ray?

20.The diagram shows a ray of light entering a glass block. Which labelled angle is the angle of refraction?

21.In the diagram, what is the angle between the incident ray and the normal?

22.What is the name of the ray that leaves a glass block after refraction?

23.A student shines a laser into a rectangular glass block at an angle. The laser exits the block parallel to the incident ray but offset. Which of the following best explains this?

24.A student places a rectangular glass block on a piece of paper and shines a ray of light into it at an angle. Which of the following is the correct method to measure the angle of refraction?

25.A student investigates refraction using a glass block. She measures the angle of incidence and the angle of refraction for several angles. Her results are: i = 10°, r = 6°; i = 20°, r = 13°; i = 30°, r = 19°; i = 40°, r = 25°. Which of the following is the most likely value for the angle of refraction when the angle of incidence is 50°?

26.A student uses a ray box to shine light into a glass block. She notices that the emergent ray is parallel to the incident ray but shifted sideways. Which of the following explains this?

27.In a refraction experiment, a student places a pencil in a glass of water. The pencil appears bent at the water surface. Which of the following correctly explains this illusion?

28.A student sets up a refraction experiment with a glass block. She measures the angle of incidence as 30° and the angle of refraction as 19°. She then increases the angle of incidence to 45°. What will happen to the angle of refraction?

29.In a refraction experiment, a student uses a ray box to shine light into a semicircular glass block along the normal (0° incidence). What does the student observe?

30.Which of the following properties of light changes when it refracts from air into glass?

31.A student performs an experiment to find the refractive index of a transparent liquid. She measures the angle of incidence in air and the angle of refraction in the liquid. Which of the following calculations gives the refractive index of the liquid?

32.The diagram shows a ray of light entering a glass block. Which labelled angle is the angle of incidence?

33.A student shines a laser into a rectangular glass block at an angle. The laser exits the block parallel to the incident ray but offset. Which of the following best explains why the emergent ray is parallel to the incident ray?

34.A student measures the speed of light in three different materials. The results are: Material X: 250,000,000 m/s, Material Y: 200,000,000 m/s, Material Z: 300,000,000 m/s. Which material has the highest refractive index?

35.Light travels from air into a glass block. The speed of light in air is 300,000,000 m/s and in glass is 200,000,000 m/s. The wavelength of the light in air is 600 nm. What is the wavelength of the light in glass?

36.A ray of light passes from water into air. The angle of incidence in water is 30°. The refractive index of water is 1.33 and of air is 1.00. Using Snell's law (n₁ sin θ₁ = n₂ sin θ₂), what is the angle of refraction in air? (sin 30° = 0.5)

37.In an experiment, a student measures the angle of incidence and angle of refraction for light entering a glass block from air. The results are shown in the table. Which pair of values is most likely to be correct?

38.A student uses a ray box to shine light into a glass block at an angle. The emergent ray is parallel to the incident ray but shifted sideways. Which of the following is the best explanation for this?

39.A ray of light enters a glass block at an angle of incidence of 0° (along the normal). The speed of light in glass is 200,000,000 m/s. What is the speed of the light in the glass block?

40.In a refraction experiment, a student places a rectangular glass block on a piece of paper and shines a ray of light into it. She measures the angle of incidence and angle of refraction for several angles. Her results are: i = 0°, r = 0°; i = 20°, r = 13°; i = 40°, r = 25°; i = 60°, r = 35°. What is the refractive index of the glass? (Use sin values: sin 0°=0, sin 20°=0.342, sin 13°=0.225, sin 40°=0.643, sin 25°=0.423, sin 60°=0.866, sin 35°=0.574)

41.Light travels at the same speed in a vacuum as it does in glass.

42.When light goes from air into a glass block, its wavelength decreases.

43.When light goes from air into a glass block, the angle of refraction is greater than the angle of incidence.

44.When light goes from air into a glass block, the frequency of the light remains unchanged.

45.What is the imaginary line drawn at 90° to the surface of a glass block called?

46.When light travels from air into glass, the ray bends:

47.The ray that leaves a glass block after refraction is called the:

48.When light travels from glass into air, it speeds up and bends away from the normal.

49.In the diagram of refraction from air into glass, which angle is measured between the refracted ray and the normal?

50.Which of the following properties of light change when it refracts from air into glass? (Select all that apply.)

51.Complete the sentence: The bending of light as it passes from one medium to another is called ___.

52.Complete the sentence: The higher the refractive index of a material, the ___ light travels through it.

53.Explain why a pencil partially submerged in water appears bent at the water surface.

54.The speed of light in air is 300,000,000 m/s. In a certain type of glass, the speed is 200,000,000 m/s. What is the refractive index of this glass?

55.The speed of light in air is 300,000,000 m/s. In a certain type of glass, the speed is 200,000,000 m/s. What is the refractive index of this glass?