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Answer i
1) red light can travel to a long distance than any other colour that's why it is used.
Answer ii
2)A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to converge.
Answer iii
3).it is because of medium
Water is a denser medium that's why it happens.
Answer iv
4).Bifocal glasses are necessary for people who have presbyopia (a condition caused by aging of the eyes) in addition to myopia, hyperopia (also called hypermetropia) and/or astigmatism. ... These bifocals looked like lenses with a diameter marked horizontally.
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