Questions like the HSC 2019 exam

Due to copyright the actual exam questions can not be published here.

Please refer to the 2020 HSC Physics exam for the published questions.

like question 27

(a) A photon is bouncing between two mirrors which have been placed one above the other. The mirrors start moving to right.Describe the motion of the photon with the mirrors in motion.

An Answer

The photon takes a zig zag path always travelling at c along the path. The length of time between photon reflections is longer for higher speeds compared with lower speeds.

Useful Reference:

The description and animation of time dilation provides a possible answer.