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Laser light of wavelength 640 nm incident on a pair of slits produces an interference pattern in which the bright fringes are separated by 7.2 mm - CBSE Class 12 Physics - Learn CBSE Forum
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![Comparison of PL and thermal emission. The PL band is centered at 640... | Download Scientific Diagram Comparison of PL and thermal emission. The PL band is centered at 640... | Download Scientific Diagram](https://www.researchgate.net/publication/231022832/figure/fig3/AS:668975742582805@1536507654656/Comparison-of-PL-and-thermal-emission-The-PL-band-is-centered-at-640-nm-and-has-a-FWHM.png)