About Light

16. What is the name of the type of lens that converges light rays to a single point?
a) Convex
b) Concave
c) Plano-concave
d) Plano-convex

17. What is the name of the optical instrument used to view distant objects?
a) Telescope
b) Microscope
c) Spectroscope
d) Periscope

18. What is the name of the optical instrument used to view small objects?
a) Telescope
b) Microscope
c) Spectroscope
d) Periscope

19. What is the name of the device that is used to measure the intensity of light?
a) Spectrometer
b) Spectrophotometer
c) Photometer
d) Radiometer

20. What is the name of the type of light that is produced by a hot object?
a) Incandescent light
b) Fluorescent light
c) LED light
d) Laser light