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

What happens to your chest when you take a breath ?

Explain, how the eye adjusts itself when a person enters a dark cinema hall from bright sunshine.

Explain, how does the eye adjust itself when person enters a dark cinema hall from bright sunnshine.

Suupose a helical spring is suspended from the roof and a very small weight is attached to its lower end. What will happen to the spring when the current is passed thorugh it? Give reason to support your answer.

What do you think Dinamani is the name of? Give a reason for your answer.

Which of the two, objective or eye piece has a large aperture? Give reason for your answer.