1. When ordering a six inch temple,its corresponding millimeter value is whichof the
following?
A. 135 mm
B. 140 mm
C. 145 mm
D. 150 mm
Answer: 150 mm
2. What is the focal length of a 2 diopter lens?
A. 500 cm
B. 39.37 inches
C. 500 mm
D. 2 meters
Answer: 500 mm
3. Wavelengths are measured in
A. Meters
B. Decimeters
C. Centimeters
D. Nanometers
Answer: Nanometers
4. Which of the following has the shortest and therefore most harmful wave-length?
A. UVC
B. UVB
C. UVA
D. INFRARED
Answer: UVC
5. When two light waves are in "in phase" they will
A. Destroy on another
B. Reduce each front by half
C. Compound one another
D. None of the above
Answer: Compound one another
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