Arnold K H Tan's answer to xy's Secondary 4 A Maths Singapore question.
Q22) How you know where to draw the lines for 1 Sec and 2 Sec later?
Q23) How to know the line of sight?
Q23) How to know the line of sight?
Q22. 1 sec = half a wavelength later
2. Line of sight is linked to the field of vision, which is light reflected off the two ends of the mirror, from each person. This is just one approach for this question.
2. Line of sight is linked to the field of vision, which is light reflected off the two ends of the mirror, from each person. This is just one approach for this question.
Ok. Thank you! (:
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