1.Which of the following refers to the visual perception of light's reflection?

A. Brightness
B. Intensity
C.Loudness
D.Frequency

2.Where does light travel slowest?

A. Air
B.Vacuum
C. Water
D. Glass

3. How do you know that light travels in straight line?

a. the occurence of dispersion
b.the process of refraction
c.the occurence of shadows
d.none of the above

4.Which among the componenet colors of white light has the longest wavelength?

a. red
b. orange
c. blue
d. violet

5 White light when disperse into its component colors produces ROYGBIV. which among these colors have the least energy?

a. red
b. orange
c. blue
d. violet​