Why the screen of a cinema hall made rough and white?

Why surface of tyres are made rough.

You cannot enjoy watching a movie from a very short distance from the screen in a cinema hall. Give reason

There are four doors leading to the inside of a cinema hall. In how many ways can a person enter into it an come out ?

Why are the ceilings of concert halls made curved? Draw a labelled diagram to illustrate your answer.

What happens to the eye when you enter a darkened cinema hall from bright sunshine ? Give reason for your answer.

A cinema hall has equidistant rows 1 m apart. The length of the cinema hall is 287 m and it has 287 rows. From one side of the cinema hall, laughing gas (N_(2)O) is released and from the other side, weeping gas (C_(6)H_(5)COCH_(2)Cl) is released. In which rows, spectors will be laughing and weeping simultaneously?

A cinema hall has equidistant rows 1 m apart. The length of the cinema hall is 287 m and it has 287 rows. From one side of the cinema hall, laughing gas (N_(2)O) is released and from the other side, weeping gas (C_(6)H_(5)COCH_(2)Cl) is released. In which rows, spectors will be laughing and weeping simultaneously?