Sir pls solve this

Dear Student,
Answer to your questions (1) and (2) are given below:
1) A ray of light passing from one medium to another does not bend its path if the angle of incidence equals to zero degree.


2) The more is the optical density of the given medium, the less is the speed of light through it.
Reason: As we know that, the speed of light decreases as it passes through more denser mediums.

For the remaining questions, please post them in different threads.
Regards,

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