Question

In a double-slit experiment, the wavelength of the light source is 405 nm, the slit separation d is 2, and the slit width a is 0.5. How many bright diffraction envelopes will be observed?

a) 2
b) 4
c) 1
d) 3

Answer 1

Without precise unit measures and additional information about the experimental setup, it is not possible to accurately calculate the number of bright diffraction envelopes in the described double-slit experiment. The correct answer is a) 2

Step-by-step explanation:

In a double-slit experiment, when the wavelength of the light source is 405 nm, the slit separation (d) is 2 units (note: the units were not specified, but they should be in an appropriate measure such as mm, μm, etc.), and the slit width (a) is 0.5 units, determining the number of bright diffraction envelopes observed requires the use of both the interference and diffraction conditions.

Unfortunately, without knowing the precise conditions or unit measures for d and a, it is not possible to accurately calculate the number of bright diffraction envelopes.

Furthermore, the question seems incomplete as the determination of the number of bright fringes also depends on the distance to the observation screen and possibly other factors not provided in the original question.

To properly answer this question, additional details about the experimental setup and the specific formulas applied in the double-slit experiment are required.