caption: Question 3 How many beams are formed when blue light, wavelength 450nm is used with a diffracting grating of 400 lines per mm.
exif: {"Image DocumentName": "Question 3 How many beams are formed when blue light, wavelength 450nm is used with a diffracting grating of 400 lines per mm.", "Image ImageDescription": "d sin \u03b8 = n\u03bb. becomes: n = d sin \u03b8 / \u03bb. grating spacing, d = 1/400 mm = mm. sin \u03b8 cannot be greater than 1.0 (with \u03b8 = 90\u00b0) n = ( mm x 1.0) / (450 nm) = (2.5 x 10-6 m) / (4.5 x 10-7 m) = 5.6. but n must be an integer. and so max n = 5. There will therefore be 11 beams.", "Image XResolution": "200", "Image YResolution": "200", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}