Unit 4: Chapter 17 - Interference

109

A thin sheet of plastic ( n = 1.60) is inserted between two panes of glass to reduce infrared ( λ = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?

1.25

Estimate the distance (in cm) between the central bright region and the third dark fringe on a screen 5.00 m from two double slits 0.500 mm apart illuminated by 500-nm light.

179

Monochromatic light ( λ = 500 nm) is incident on a soap bubble ( n = 1.40). How thick is the bubble (in nm) if destructive interference occurs in the reflected light?

the respective positions of constructive and destructive interference of light from the two sources.

The bright and dark bands you see in a photograph of a double slit interference pattern represent - the respective positions of destructive and constructive interference of light from the two sources. - the respective positions of bright and dark particles of light. - the respective positions of the crests and the troughs of the light wave. - an interference pattern that is not present unless it is produced by the camera lens. - the respective positions of constructive and destructive interference of light from the two sources.

114

The light reflected from a soap bubble ( n = 1.40) appears red ( λ = 640 nm) at its center. What is the minimum thickness (in nm)?

2.7

Two slits separated by 0.10 mm are illuminated with green light ( λ = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away.