JYA Assignment Questions

Light and Refraction

1) Calculate the unknown value in the following cases

i

r

N

45.0

28.3

30.0

49.0

28.9

1.33

79.8

0.88

20

0.41

20

0.54

60

1.13

60

1.13

35

1.00

2) If it were possible to have a vacuum air boundary with a refractive index of 1.00029 what would the angle of refraction be for the following angles of incidence.
a) 30 0
b) 30.0 0
c) 30.00 0
d) 30.000 0

3) The speed of light in glass is 2.03 x 108 ms -1 and in water is 2.26 x 108 ms -1 . For a ray of light passing from glass to water what is
a) The refractive index?
b) The critical angle?

4) The table below gives the values for the refractive index of glass for different coloured rays of light. In each case what is the critical angle?

Colour
Refractive Index
Red
1.520
Green
1.526
Blue
1.531
Violet
1.538

 

Use the speed of light in air as 3.00 x 10 8 ms-1 and glass from Q3.

Diffraction and Inteference

5) In a Young’s slit experiment, the distance between the central bright fringe and the next one is 0.0240m. The light used has a wavelength of 475nm and the slit separation is 0.8 x 10-4 m.
a) How far away is the screen?
b) What would the separation of the fringes be if light of wavelength 611nm was used?

6) In a Young’s double slits experiment, the screen is 4.5m away, the separation of the fringes is 0.037m and the wavelength is 490nm. What is the slit separation?

7) Red light [wavelength 713nm] is used in Young’s slits experiment. The slit separation is 1.2 x 10-4 m, the distance to the screen is 2.75m. What is the distance between the central bright fringe and the 3rd one?

 

 

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