Sheena Grace Bitgue - Refraction Worksheet PDF

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Science Grade 10...

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REFRACTION WORKSHEET SECTION 12.1 – WHAT IS REFRACTION? Read Section 12.1 on pages 515 to 519 of the textbook and answer the following questions. 1. Complete the following table about refraction: What is refraction? Refraction the bending or change in direction of light when it travels from one medium to another. What is the value of the speed of light? Measurements of the speed of light clearly indicate that this is indeed the case. Light travels 3.00 ✖ 108 m/s in the vacuum, at the speed of 2.26 ✖ 108 m/s in the water , and a speed of 1.76 ✖ 108 m/s in acrylic. What is the angle of refraction? Angle of reflection the angle between the refracted ray and the normal. Mirrored sunglasses allow you to see out but do not allow Give one example of partial reflection and others to see in. refraction. 2. The following diagram represents a beam of light going from one medium into another. a. Label the blanks on the diagram in the table below.

Term A B C D E

Normal Incident ray Angle of incidence Refracted ray Angle of refraction

b. In the diagram above, one medium is air in which light has a speed of 3.00 x 108 m/s and the other medium is ice in which light has a speed of 2.29 x 108 m/s. Based on this information, identify medium A and medium B as either air or ice in the table below, and explain your decision. Medium Identity of medium A Medium A is air in which light has a speed of 3.00 x 108 m/s. B Medium B is ice in which light has a speed of 2.29 x 108 m/s. Explanation Light travels straight lines through the air. And the light is an incident ray. 3. Which way will light bend in comparison to the normal (towards the normal or away from the normal) if it enters a new medium in which it travels*: Faster in the new medium? The light bends away from the normal when it speeds up in the medium.

Name: Slower in the new medium?

The light bends toward the normal when it slows down in the medium.

*Note: To answer question number 3, refer to the second Rule for Refraction which states: Light bends toward the normal when the speed of light in the second medium is less than the speed of light in the first medium. Light bends away from the normal when the speed of light in the second medium is greater than the speed of light in the first medium. SECTION 12.4 –THE INDEX OF REFRACTION Read Section 12.4 on pages 524 to 525 of the textbook and answer the following questions. The following is the equation for the index of refraction.

1. Complete the following table about the index of refraction: Define the index of refraction. Index of refraction the ratio of the speed of light in a vacuum to the speed of light in a medium. What is n? n is the index of refraction. What is c? c is the speed of light in a vacuum. What is v? v is the speed of light in a given medium. 2. Complete the following calculations. SHOW YOUR WORK FOR ALL CALCULATIONS. Important Note: Try "Sample Problem 1" on page 524 and "Sample Problem 2" on page 525 before trying these questions, and watch the second video posted in the lesson. Calculation 1: The speed of light in sodium chloride is 1.96 x 10

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m/s. Calculate the index of refraction of sodium

chloride. SHOW YOUR WORK in the box below. (2 marks) ANSWER: n=c/v n? c= 3.00 x 108 m/s v= 1.96 x 10 m/s n= 3.00 x 108 m/s / 1.96 x 10 m/s n = 1.53 The index of refraction for sodium chloride is about 1.53. Calculation 2: Light traveling through air encounters a second medium which slows the light to 2.05 x 10

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m/s. What

is the index of refraction of the second medium? SHOW YOUR WORK in the box below. (2 marks) ANSWER: n=c/v n? c= 3.00 x 108 m/s v= 2.05 x 10 m/s n= 3.00 x 108 m/s / 2.05 x 10 m/s n = 1.46 The index of refraction of the second medium is about 1.46. What is the second medium (refer to Table 1 on page 542)? Answer in the box below. (1 mark)

Name: ANSWER: quartz Calculation 3: Light travels through a substance at 2.04 x 108 m/s. What is the index of refraction of the liquid? SHOW YOUR WORK in the box below. (2 marks) ANSWER: n=c/v n? c= 3.00 x 108 m/s v= 2.04 x 10 m/s n= 3.00 x 108 m/s / 2.04 x 10 m/s n = 1.47 The index of refraction of the liquid is about 1.47. What type of liquid is it (refer to Table 1 on page 542)? Answer in the box below. (1 mark) ANSWER: Vegetable oil Calculation 4: Calculate the speed of light in glass. To find the index of refraction of glass, please refer to Table 1 on page 542 of your textbook. SHOW YOUR WORK in the box below. (2 marks) ANSWER: v= c/n v=? c= 3.00 x 108 m/s n=1.52 v= 3.00 x 108 m/s / 1.52 v= 2.00 x 108 m/s The speed of light in the glass is about 2.00 x 108 m/s. Calculation 5: What is the speed of light in meters per second in a material with an index of 2.0? SHOW YOUR WORK in the box below. (2 marks) ANSWER: v= c/n v=? c= 3.00 x 108 m/s n=2.0 v= 3.00 x 108 m/s / 2.0 v= 1.50 x 108 m/s The speed of light in a material is 1.50 x 108 m/s ....