It means the scientific study of sight and the behavior of light, or the properties of transmission and deflection of other forms of radiation
A dilemma is a forced choice between two options.
it's not specified whether it has to be between family or friends.
A moral dilemma is a a forced choice between two options of moral character. (the correct answer is the first one).
Anne frank is born, then they move to Holland, then the Nazis move their power to Holland, then they go into hiding, then she starts her diary.
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