$W11 Activity 1 - Reflection and Refraction$

W11 Activity 1 - Reflection and Refraction

Presentation

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Physics

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9th - 12th Grade

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Practice Problem

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Easy

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NGSS

HS-PS4-1, HS-PS4-5, MS-PS4-2

Standards-aligned

Nicholas Carrillo

Used 28+ times

FREE Resource

13 Slides • 6 Questions

W11 Activity 1 -

Law of Reflection

By Nicholas Carrillo

Decide what angles you can measure to find a pattern or relationship between the reflected and incident light-rays.

We are going to watch a video of laser light reflecting off a mirror.

Poll

How do you think the incident and reflected angles compare?

The incident angle is greater than the reflected angle.

The incident angle is less than the reflected angle.

The incident and reflected angles have the same value.

What is the relationship between incident and reflected rays’ angles?

…Let’s Find Out!

Click this text to access activity

Use the protractor to measure Angle 1 and Angle 2

Move the laser pointer and measure multiple angles, what do you notice about all the pairs of angles.

Multiple Choice

How are the angles of the incident and reflected rays related?

The angles have the same value

The incident angle is less than the reflected angle

The incident angle is greater than the reflected angle

There is no relationship between the angles.

Law of Reflection

The angles of incident and reflected rays are the same value.

Some text here about the topic of discussion

Now we want to look at how light bends when going from one medium to another.

Set the incident angle to 30 degrees and measure the refracted angle

Take the sine of both angles, and divide the incident by the refracted.

Now set the incident angle to 50 degrees and find the refracted angle.

Divide the incident by the refracted angle. Do it again for 60 degrees.

Multiple Choice

Which best describes the relationship you see when light goes from air to water?

The incident angle is greater than the refracted angle

The incident angle is less than the refracted angle

The incident angle is the same as the refracted angle

There is no relationship between the two.

Multiple Choice

The ratios between the sines of the incident and reflected angles should have a similar value. Which option is the closest to that value?

$n\ =\ \frac{\sin\left(\theta_i\right)}{\sin\left(\theta_r\right)}$

n = 1.43

n = 1.37

n = 1.29

n = 1.33

Refractive Index

The index of refraction (n) determines how much light bends when going from one medium to another.

Snell's Law

Multiple Choice

Light travels from air (n = 1.00) into a "mystery" material. The incident ray of light hits the surface at angle of 43^o and the refracted ray enters the mystery material at an angle of 27^o. What is the index of refraction of the mystery material? n₁sin(Θ₁) = n₂sin(Θ₂)

1.5

1.0

0.67

2.1

Video Response

What do you think causes the straw to appear different in the water, when compared to air?

Open Video Recorder

W11 Activity 1 -

Law of Reflection

By Nicholas Carrillo

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