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We aim a red (620 nm) laser onto a small screen that has two slits that...

We aim a red (620 nm) laser onto a small screen that has two slits that are 0.1 mm apart. Each slit has a width of 0.03 mm.The light coming out of the two slits is projected onto a big screen a distance X from the slits. In the photo on the right you can see the pattern that’s visible on the big screen.Using a ruler, we determine that the distance between two adjacent bright spots is equal to 12 mm.The red laser has a wavelength of 620 nm and its beam has a circular cross section with a diameter of 0.8 mm. The power rating of the laser “1.5 mW“ (i.e. 1.5 milliwatts) which we may assume is the power of the light coming out of the laser.

  1. [4 points] Calculate how many photons are being emitted by the laser each second.

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