Chapter 7 Flashcards
A flashlight beam is seen because of
refraction.
dispersion.
diffuse reflection.
specular reflection.
diffuse reflection.
A lens thicker at the center than at the edge is a______________ lens.
diverging
convex
Both (b) and (c)
converging
diverging
A light wave traveling in air strikes a plane mirror surface at an angle of 30 degrees relative to the normal. The wave is reflected at an angle of
60 degrees relative to the normal.
30 degrees relative to the normal.
30 degrees relative to the surface.
None of these answers
30 degrees relative to the normal.
A mirage is caused by hot air near the ground
reflecting light rays downward.
reflecting light rays upward.
refracting light rays upward.
refracting light rays downward.
refracting light rays upward.
A pencil partially submerged in a glass of water appears broken or offset because of
polarization.
refraction.
diffraction.
interference.
refraction.
A rainbow results from
neither reflection or refraction.
reflection only.
refraction only.
both reflection and refraction.
both reflection and refraction.
All real images
are virtual.
are inverted.
can be focused on a screen.
cannot be focused on a screen.
can be focused on a screen.
An example of a converging spherical mirror is a
flashlight reflector.
bathroom mirror.
spherical truck mirror.
hubcap.
bathroom mirror.
An example of a diverging spherical mirror is
a round Christmas tree ornament.
a flashlight reflector.
None of these
a bathroom mirror.
a round Christmas tree ornament.
Images of objects are formed by lenses because of
refraction.
internal reflection.
diffraction.
All of these
refraction.
Polarization involves
interference.
only longitudinal waves.
the orientation of field vectors.
diffraction.
the orientation of field vectors.
Polarizing sunglasses are useful because they are able to
reflect glare.
use the critical angle to block light.
refract reflected light, which causes glare.
absorb reflected light, which is polarized
absorb reflected light, which is polarized.
The bending of light because of a speed change as it moves from one medium to another is called
refraction.
The Sun appears reddish as it sets because
more of the longer, redder wavelengths are scattered by the atmosphere.
the Sun emits more radiation at longer wavelengths at sunset.
the Doppler shift lowers the frequency as a given spot on Earth rotates away from the Sun.
more of the shorter, bluer wavelengths are scattered by the dust and haze.
more of the shorter, bluer wavelengths are scattered by the dust and haze.
The bending of waves around corners is called
refraction
interference
diffraction
reflection
diffraction
The change in the direction of a wave resulting from its encountering a small slit is known as
interference.
diffraction.
polarization.
reflection.
diffraction.
The law of reflection
is limited to regular reflection.
applies only to plane mirrors.
applies to all reflecting surfaces.
must be modified for diffuse reflection.
applies to all reflecting surfaces.
The ratio of the speed of light in a vacuum to the speed of light in a medium is known as the index of
diffraction.
None of these
reflection.
refraction.
refraction.
The separation of white light into its component colors is called
polarization.
refraction.
diffraction.
dispersion.
dispersion.
We explain light today
mostly as a wave phenomenon.
as something completely unknown.
as having both wave and particle behavior.
mostly with particle models.
as having both wave and particle behavior.
