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
Answer: a) Convex
17. What is the name of the optical instrument used to view distant objects?
a) Telescope
b) Microscope
c) Spectroscope
d) Periscope
Answer: a) Telescope
18. What is the name of the optical instrument used to view small objects?
a) Telescope
b) Microscope
c) Spectroscope
d) Periscope
Answer: b) Microscope
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
Answer: c) Photometer
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
Answer: a) Incandescent light
