Quiz: Light And Reflection
In the study of light, something we potentially take for granted every day, reflection is the change in direction of a wavefront at an interface between two different media so that it returns into the medium where it originated.
- 1.The detection of biological fluids using an ultraviolet light source by forensic investigators is an example of:
- A.
Incandescence
- B.
Fluorescence
- C.
Chemiluminescence
- D.
Bioluminescence
- E.
Phosphorescence
- 2.In the electromagnetic spectrum, which of the following is TRUE regarding microwaves.
- A.
Their wavelengths are shorter than visible light.
- B.
Microwaves can be detected by human eyes.
- C.
They travel slower than visible light.
- D.
Their wavelenths are longer than visible light.
- E.
They travel faster than visible light.
- 3.The shortest time interval in which a wave motion completely repeats itself (i.e., makes one complete vibration or oscillation) is called the
- A.
Amplitude
- B.
Wavelength
- C.
Period
- D.
Frequency
- E.
Speed
- 4.In a transverse wave,
- A.
The particles move parallel to the direction of the wave motion.
- B.
The particles move perpendicular to the direction of the wave motion.
- C.
Energy causes the particles to move forward with the wave.
- D.
Energy is propagated by compressions and rarefactions.
- E.
The speed is unaffected by the type of medium used.
- 5.The angle of incidence for a wave
- A.
Can be measured between the incident ray and the normal
- B.
Can be measured between the incident wavefront and the boundary
- C.
Is equal to the angle of reflection
- D.
Does not depend on the frequency of the source
- E.
All of the above
- 6.An student is located 1.8 m from a plane mirror. How far is the image from the student?
- A.
0 m
- B.
0.9 m
- C.
1.8 m
- D.
2.7 m
- E.
3.6 m
- 7.A concave mirror has a focal length of 30 cm. If an object is placed 45 from the vertex of this mirror, the image will be:
- A.
Larger and inverted
- B.
Smaller and inverted
- C.
Larger and upright
- D.
Smaller and upright
- E.
The same size and inverted
- 8.As an object is placed further and further from a concave mirror:
- A.
The image becomes virtual
- B.
The image will get larger and larger
- C.
Eventually, no image will be formed
- D.
The image approaches the focal point
- E.
The image approaches the centre of curvature
- 9.When using the mirror equation and the magnification equation for curved mirrors, which of the following is FALSE?
- A.
Convex mirrors have a negative focal length
- B.
If an image is larger than the image, its magnification is >1.0
- C.
The distance of the image in convex mirrors will always have a negative value
- D.
The distance of the object is always a positive value, regardless of whether the mirror is concave or convex
- E.
A negative magnification means that the image is inverted
- 10.An object placed between the focal point and the vertex of a concave mirror will produce:
- A.
No image
- B.
An image that is smaller and virtual
- C.
An image that is larger and virtual
- D.
An image that is smaller and real
- E.
An image that is larger and real
- 11.All parallel rays that approach a concave mirror:
- A.
Must reflect through the focal point
- B.
Must reflect through the centre of curvature
- C.
Must reflect somewhere between the focal point and the centre of curvature
- D.
Must reflect back along the incident path
- E.
None of the above
- 12.All images in plane mirrors are:
- A.
The same size as the object and real
- B.
Larger and upright
- C.
Smaller and upright
- D.
Smaller and inverted
- E.
Virtual and upright
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