The video tutorial explains the behavior of light as it propagates in straight lines and interacts with different surfaces. Initially, it covers the law of reflection, where light bounces off mirrors, maintaining equal angles of incidence and reflection. The tutorial then explores refraction, demonstrating how light bends when passing through a glass slab due to differing speeds in air and glass. A practical demonstration using a half circle shows how light refracts when hitting the center, emphasizing the concept of indices of refraction. Finally, the video highlights the application of these principles in optical devices like lenses, telescopes, and the human eye.

What happens to light when it encounters a mirror?

• It passes through the mirror.

• It is absorbed by the mirror.

• It bends around the mirror.

• It is reflected off the mirror.

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NGSS.MS-PS4-2

According to the law of reflection, the angle of incidence is always equal to the angle of what?

• Dispersion

• Diffraction

• Reflection

• Refraction

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NGSS.MS-PS4-2

What happens to light when it passes through a glass slab placed perpendicular to the light ray?

• It continues in a straight line.

• It is absorbed by the glass slab.

• It bends and refracts.

• It is reflected back.

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NGSS.MS-PS4-2

Why does light refract when passing from air to glass?

• Because glass absorbs some of the light.

• Because light prefers to travel in a straight line.

• Because the speed of light is the same in both media.

• Because the speed of light is different in air and glass.

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NGSS.MS-PS4-2

What is the term used to describe the bending of light as it passes from one medium to another?

• Dispersion

• Diffraction

• Refraction

• Reflection

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NGSS.MS-PS4-2

What is the significance of the indices of refraction?

• They show the direction of light.

• They measure the intensity of light.

• They indicate the speed of light in different media.

• They determine the color of light.

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NGSS.MS-PS4-2

Why is a half-circle glass convenient for demonstrating refraction?

• Because it absorbs light.

• Because it reflects light.

• Because the light always travels along the radius, which is perpendicular to the tangent.

• Because it changes the color of light.

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NGSS.MS-PS4-2

What happens to light when it hits the center of a half-circle glass?

• It only refracts at the center.

• It does not refract at all.

• It refracts at the center and at the end.

• It reflects back.

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NGSS.MS-PS4-2

Which optical devices use the laws of refraction for their operation?

• Mirrors and prisms

• Lenses, glasses, telescopes, and eyes

• Cameras and projectors

• Microscopes and binoculars

What is the primary reason light refracts when moving between different media?

• To decrease its intensity

• To change its color

• To increase its speed

• To travel the shortest time between two points

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NGSS.MS-PS4-2