In the diffraction experiment, if the distance between slit and screen Equals Ten thousand times the distance between the central fringe to the first fringe. Then find the wavelength of the laser wave that diffracted on the slit with a width of 6 mm. *

a .105 nm

b .337 nm

c .485 nm

d .596 nm

e .659 nm

2 . In the diffraction experiment, if the width of a single slit is equal to 100000 of wavelength, what the angle to the position on the screen if the spot order is one? *

a .0.001 degree

b .0.004 degree

c .0.005 degree

d .0.008 degree

e .0.009 degree

3 . If the intensity of the incident radiation is equal to Equals Ten times the intensity of transmitted radiation? What is the value of transmission? *

a. zero

b. 100%

c .50%

d .20%

e .10%

4 . If the ratio between the intensity of transmitted radiation and the intensity of the incident radiation equals "half"? and absorption coefficient equal to a square of thickness? what the value of thickness? *

a .1.12 cm

b .0.69 cm

c .0.35 cm

d .0.47 cm

e .0.58 cm

f .0.13 cm

5 . When double-slit totally cover, then irradiated with laser source have wavelength 632.8 nm, Find the distance from the principal maximum to the nth diffraction minimum, when the distance from the screen to slit is 50 cm and reflected angle of radiation equal to 45 degrees. Only write a number of the distance. *

White light, the compounds of a spectrum are distributed by a diffraction grating (9000 line /mm), so if the slitter has a measure of the third-order diffraction angle of the red light of a wavelength 640nm? *

a.10 Degree

b .11 Degree

c .12 Degree

d.13 Degree

e.14 Degree

6.Use a diffraction grating that contains (5,000 lines/mm) to measure the wavelength of the laser when order diffraction is (m=1) and the distance from the grating to screen is equal to ten times of distance from first-order order on screen *

a.497.5 nm

b.632.4 nm

c.553.4 nm

d.392.3 nm

e.321.8 nm

7.If L1= 10 m and L2= 15 m, find the beam divergence angle of the laser, when beam diameter at points (1) equal to 50 cm, and the beam diameter at points (2) equal to twice of diameter at points (1). *

a.0.1

b.0.2

c.0.3

d.0.6

e.0.8

8.If distance along the laser axes from the end of laser to point (1) and point (2) have the same value. And beam diameter at points (1) and beam diameter at points (2) also have the same value. Then the beam divergence angle of laser is? *

a.one milliradians

b.zero milliradians

c.Infinite milliradians

d.High beam divergence angle

e.Low beam divergence angle