Optics

Question 1

Which of the following is true about refraction?

a. Refracted light changes speed only
b. Refracted light changes speed and wavelength
c. Refracted light changes speed and frequency
d. Refracted light changes speed, frequency, and wavelength

Answer 1

b. Refracted light changes speed and wavelength

Question 2

Pilots need accurate night vision to see effectively both inside the cockpit and to scan the sky for other aircraft. Pilots are advised to “close one eye when using a light to preserve some degree of night vision”. Why is this?

a. Light adaptation is lost very slowly because the pigment rhodopsin is bleached
b. Dark adaptation is lost very slowly because the pigment L-wave sensitive opsin is bleached
c. Dark adaptation is lost very quickly because the pigment rhodopsin is bleached
d. Light adaptation is lost very quickly because the pigment S-wave sensitive opsin is bleached

Answer 2

c. Dark adaptation is lost very quickly because the pigment rhodopsin is bleached