2021 CAIE AS & A level October November Physics Paper 13 Q N 30 (9702/13/O/N/21) by Sajit C Shakya
2021 CAIE AS & A level October November Physics Paper 13 Q. No. 30 (9702/13/O/N/21) by Sajit Chandra Shakya from Nepal Chapter - SUPERPOSITION OF WAVES A ray of green light is incident normally on a diffraction grating. Several bright spots are produced on a screen on the other side of the grating, as shown. Which pair of changes could result in bright spots at exactly the same angles as previously? A Use blue light and increase the distance between the grating and the screen. B Use blue light and increase the number of lines per unit length in the grating. C Use red light and increase the distance between the grating and the screen. D Use red light and increase the number of lines per unit length in the grating.
