9. The phenomena where two light waves combine and produce regions of reinforcem

Question

9. The phenomena where two light waves combine and produce regions of reinforcement and regions of cancellation is known as The correct explanation for the regions of cancellation is that neither neither wave contained any momentum. the two waves were a half-wavelength out of phase. the two waves were in phase. 10. Light of 500 nm wave is reflected from a thin film of air between two glass plates. u length The thickness of the film is 1 um (1000 nm). a. How much farther does the light refected from the bottom surface travel than the light reflected from the top of the film (assuming near normal incidence)? b. How many wavelength of light does this represent tshow calculation) 11. Light of 500 nm is incident upon a double sit with a separation of d 0.4 mm (4x10-4m). A screen located x 2.0 m from the double slit. At what distance y from the center will the first dark fringe beyond the center fringe appear? (show calculation) 12. When a beam of light passes through a narrow slit we can observe some light in the "geometricar shadow of the slit. This light arrived by the procet of reflection. refraction. dittraction interference 13, A common use of a grating is to split light in to ditt erent polarizations separate light into its separate wavelengths. reflect light into a different direction. focus light onto the retina. 14. The polarization of a light wave is determined by the direction of the light's velocity perpendicular to both the electric and magnetic field of the oscinating electric field. of the fuorescent tube used as a light source. .15. Max found that the speed propag on "r alertenmagnntic wave can be calculated from the equation v v(k/k where k is tho Coulomt's const to the magnetic fold const (1 10-7 NA2) what is the speed of propagation for an electromagnetic wave? What can you conclude from tho fact that the speed ot propagation for an electromagnetic wave equals than of the speed of light about the relationsh p between ight and electromagnetic waves

Explanation / Answer

9. Answer for the fill in the blank is:- Interference.

If the two wave interfere to cancel each other then they are half-wavelength out of phase.

So, the correct option is the third one.

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10.a

The difference in distance traveled is given by,

x = 2µd = 2(1)(1000 nm) , where µ = 1 is the refractive index of air.

or, x = 2000nm

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10.b.

number of wavelength of light is n = x/ = 2000nm/500nm

or, n = 4

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11.

Location of first dark fringe is,

y = x/2d = (2m)(500nm)/2(4X10-4m) = (2m)(500X10-9m)/2(4X10-4m)

or, y = 1.25mm or 1.25X10-3m

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12.

This happens due to diffraction.

So, the correct option is the third one.

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13.

Diffraction grating is used to separate light into its different wavelengths.

So the correct option is the second one.

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14.

The polarization direction is along the direction of the electric field.

So the correct option is the third one.

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15.

v = (k/k')1/2 = [(9X109N-m2/C2)/(1X10-7N/A2)]1/2

or, v = 3X108 m/s

This proves that light is also an electromagnetic wave.

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This concludes the answers. Check the answer and let me know if it's correct. If you need any more clarification, modification or correction, feel free to ask.....

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