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PhySci Chapter 20
Test Description: PhySci Chapter 20
Instructions: Answer all questions to get your test result.
1) the metric unit of light intensity
A
candela
B
focal length
C
refraction
D
normal
2) the distance from a lens to its principle focus (the point at which all the rays converge)
A
lens
B
virtual image
C
real image
D
focal length
3) an object that reflects light rays
A
luminous
B
illuminated
C
reflection
D
candela
4) the measure of how bright the light from a light source is
A
candela
B
focal length
C
intensity
D
normal
5) the angle of incidence must be equal to the angle of reflection
A
law of refraction
B
law of reflection
C
intensity
D
focal length
6) a transparent object that uses the property of refraction to magnify or reduce images
A
lens
B
virtual image
C
real image
D
light
7) electromagnetic radiation of any wavelength, usually used in relation to the visible portion of the spectrum
A
candela
B
reflection
C
intensity
D
light
8) an object that emits light waves
A
virtual image
B
illuminated
C
luminous
D
real image
9) an imaginary line drawn perpendicular to the surface of a mirror or transparent substance through which light travels
A
virtual image
B
normal
C
real image
D
focal point
10) an image produced in front of a mirror
A
reflection
B
refraction
C
virtual image
D
real image
11) the return of waves after they strike a surface
A
light
B
refraction
C
reflection
D
intensity
12) the bending of waves as they pass from one medium into another
A
reflection
B
refraction
C
intensity
D
light
13) the image that appears to exist beyond a mirror
A
refraction
B
reflection
C
virtual image
D
real image
*select an answer for all questions
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