DSE 2021 P1A 10-20

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#80e MC11

#wave

#78e MC13

#critical angle #refraction

#77e MC14

#superposition #interference

#90e MC15

#stationary wave

#89e MC16

#double slit

#76e MC17

#grating

#88e MC18

#lens

#81e MC20

#microwave #echo

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