Electromagnetic Fields and Optics

Which statement about wave propagation is correct?

• Light waves move fastest through a diamond.

• Radio waves move faster through glass than through air.

• Sound waves move faster through air than through glass.

• Electromagnetic waves move fastest through a vacuum.

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White light is refracted as it passes from the air into a glass prism, separating the colors that make up the original white light. This happens because

• all light travels at the same slower speed in glass than in air

• all light travels at the same faster speed in glass than in air

• different colors of light travel at different speeds in glass

• red light travels faster in glass than in air

A ray of light is incident on a plane mirror and the angle of incidence is 25 degrees. What is the angle of reflection?

• A. 0 degrees
• B. 50 degrees
• C. 90 degrees
• D. 25 degrees

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NGSS.MS-PS4-2

• absorption

• diffraction

• reflection

• refraction

• interference

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NGSS.HS-PS4-1

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NGSS.HS-PS4-5

Refraction is the bending of a wave disturbance as it passes from one _________ into another.

• glass
• medium
• area
• boundary

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What happens to the image when you move the candle to the focal point F₁?

• Get smaller and moves toward the lens

• Get bigger and moves toward the lens

• Get smaller and moves away from the lens

• Get bigger and moves away from the lens

• No image will appear

Wavelengths on the right side of the Electromagnetic spectrum are ______________.

• short
• long
• average

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NGSS.HS-PS4-1

This picture shows a _____________ lens. It _____________ light rays.

• concave; diverges

• convex; converges

• convex; diverges

• concave; converges

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As wavelength decreases in the electromagnetic spectrum the frequency _____. 

• decreases
• stays the same
• increases
• doubles

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NGSS.HS-PS4-1

Waves with the longest wavelength have the ____ frequency. 

• lowest
• higest

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