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Lenses Review
Lenses Review
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A review of refraction, reflection, and lenses for college prep physics.
Flashcards
25 cards
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Questions
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Answers
1
What is the speed of light in a substance whose index of refraction is 1.62?
2.24 x 108 m/s
2.16 x 108 m/s
1.79 x 108 m/s
1.85 x 108 m/s
2
Which type of lens is shown?
Convex, Diverging
Concave, Diverging
Concave, Diverging
Convex, Converging
3
The speed of light through any material is slower than its speed in a vacuum.
True
False
4
What does this figure show? as it passes from air to glass.
light reflecting
light reflecting, refracting, and being absorbed
light both reflecting and refracting
light refracting
5
This refractive effect is due to
a finger that has been severed twice.
an angle of incidence unequal to the angle of refraction.
different indexes of refraction of glass and air.
different wavelengths of light passing through glass.
6
For light, refraction generally occurs when it passes from one material to another.
False
True
7
What does the "F" stand for in these diagrams?
fixed point
real image location
focal point
frontal point
8
Light travels quickly through some materials and more slowly through others.
False
True
9
The angle of refraction in this example is indicated by
θ2
θ1
n2
n1
10
Refraction refers to the fact that
a change in light's speed results in its direction change.
a change in light's direction results in its speed changing.
a change in light's direction results in its color changing.
a change in light's speed results in its color change.
11
The direction of a reflected ray of light is given by
the law of reflection
the law of refraction
the law of incidence
Snell's law
12
Which variable stands for the speed of light in a vacuum?
c
v
n
i
13
Under what condition does refraction NOT occur?
When light strikes a boundary parallel to the normal.
When light passes from air to glass.
When light strikes a boundary at an angle.
When light passes from one medium to another.
14
Which type of lens is shown?
Concave, Diverging
Convex, Converging
Convex, Diverging
Concave, Diverging
15
When light travels through a dense material like water, however, its speed
is the same as in a vacuum.
is still too fast to measure.
is reduced.
is increased.
16
On which structure in the eye must an image be focused, in order to see clearly?
the retina
the lens
the optic nerve
the cornea
17
The dewdrops on this fern act as
plane lenses.
convex lenses.
diverging lenses.
concave lenses.
18
A light beam passes from air (n = 1.00) into water (n = 1.33). The angle of refraction is 41°.
The angle of incidence is 0.87°.
The angle of incidence is 61°.
The angle of incidence is 0.49°.
The angle of incidence is 30°.
19
The index of refraction of a material is the factor by which it ____________ the speed of light
increases
reduces
20
What is this equation?
Ohm's Law
Hooke's Law
Snell's Law
Newton's 2nd Law
21
Which type of image is formed at the point F?
a real image
a diverging image
a convex image
a virtual image
22
A ray of light strikes a surface at 35° to the normal. It is reflected at
55° to the normal.
Not possible to tell without knowing index of refraction.
35° to the normal.
75° to the normal.
23
The speed of light in a vacuum is c = 3 x 10
8
m/s.
True
False
24
The direction of the refracted ray is given by
the index of refraction
Snell's law
the law of reflection
the law of incidence
25
Substance 1 has index of refraction = 1.22; substance 2 has index of refraction = 1.45.
The speed of light is greater in substance 1 than 2.
The speed of light is less in substance 1 than 2.
The speed of light is the same in substance 1 as 2.
