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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

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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
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C. 1.3 X 10 -4 cm
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