Taher physics- Refraction and Lenses

How is information carried in an optical fiber?

• by sound

• by different colors

• by electrical impulses

• by light

For the situation shown in the figure below, which of the substances listed below should be chosen to put in front of the pencil to make its "break" the most pronounced?

• flint glass

• vacuum

• ethanol

• water

A light ray is traveling through an unknown material when it intersects ethanol (n = 1.36) at an incident angle of 62.0°. If the angle of refraction is 46.4°, what is the index of refraction of the unknown material?

• 1.12

• 1.66

• 0.985

• 2

If a refracted ray moves away from the normal, the speed of light of the ray

in this material is __________ that of the incident ray.

• unrelated to

• less than

• greater than

• the same as

If a substance has a critical angle of 50°, what happens to the light from an incident angle hitting the boundary at 30°?

• It is stopped

• It is reflected

• It is diffused.

• It is refracted

What is dispersion?

• the separation of light into its spectrum

• the refraction of light

• the combining of colored light into white light

• the reflection of colored light

The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.

• refracted angle

• reflected angle

• critical angle

• normal angle

What is the speed of light in a diamond (n = 2.42)?

• 2.42×10⁸ m/s

• 1.24×108 m/s

• 7.26×10⁸ m/s

• 3.00×10⁸ m/s

A light ray traveling through crown glass (n = 1.52) intersects a sheet of flint glass (n = 1.61) at an angle of 27.3°.

What is the angle of refraction?

• 0.839°

• 33.0°

• 25.7°

• 0.433°

According to Snell's law, light traveling from a vacuum to glass will __________

• speed up

• travel at the same speed

• stop completely

• slow down