monochromatic in phase light of wavelength 812nm is incident on a piece of metal with either one

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Question

Monochromatic, in phase light of wavelength λ=812nm is incident on a piece of metal with either one or two slits on it - it is difficult to see to determine which. The diffraction pattern is observed on a viewing screen that is located 60cm away from the metal plate. The first two minima are measured to be 8cm and 25.6cm away from the central maxima. What is the brightness of the light at a distance of 12cm from the central maxima, relative to the brightness of the central maxima?

          Monochromatic, in phase light of wavelength λ=812nm
 is incident on a piece of metal with either one or two slits on it - it is difficult to see to determine which.

The diffraction pattern is observed on a viewing screen that is located 60cm
 away from the metal plate. The first two minima are measured to be 8cm
 and 25.6cm
 away from the central maxima.

What is the brightness of the light at a distance of 12cm
 from the central maxima, relative to the brightness of the central maxima?

Added by Mark C.

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