🔍
A slit of width ‘a’ is illuminated by white light. For what value of ‘a’ will  the first minimum for red light fall at an angle of 300 wavelength of red  light is 6500 A0
A. 1.1 x 10 -3 cm  
B. 1.4 X 10 -4 cm  
C. 1.3 X 10 -4 cm  
D. 1.6 X 10 -4 cm
0 like 0 dislike

1 Answer

C. 1.3 X 10 -4 cm
0 like 0 dislike

Related questions

The number of lines on plane gratings is 5000. If it is illuminated by a wavelength of light 6000 A0, how many orders will be visible? A. 3 B. 3.33 C. 4 D. 2.0
Answer : A. 3...

View solution
0 like 0 dislike
1 answer

Find the maximum value of resolving power of a grating 3 cm wide having 5000 lines per cm, if the wavelength of light used is 5890 A0. A. 40000 B. 45000 C. 4500 D. 5000
Answer : B. 45000...

View solution
0 like 0 dislike
1 answer

In plane transmission grating, the angle of diffraction for second order maxima for wavelength 5 x 10 -5 cm is 30 0. Calculate the number of lines in one centimeter of the grating surface. A. 1000 lines/cm B. 5000 lines/cm C. 500 lines/cm D. 10000 lines/cm
Answer : B. 5000 lines/cm...

View solution
0 like 0 dislike
1 answer

In case of thin film of non-uniform thickness, when illuminated with white light, the film appears colored. This is due to change of what factor? (a) Conditions for path difference at different points of ... of film (c) Thickness of film is different at different points of film (d) All of above
Answer : (d) All of above...

View solution
0 like 0 dislike
1 answer

Fraunhofer diffraction at a Plane Grating What is the meaning of grating element for a diffraction grating? A It is the width of a single slit B. It is the width of the opaque space C. It is the distance between two slits D. It is the width of diffraction grating
Answer : C. It is the distance between two slits...

View solution
0 like 0 dislike
1 answer

50.5k questions

47.1k answers

240 comments

7.0k users