Question

Give reasons:
You cannot enjoy watching a movie from a very short distance in a cinema hall.

Answer 1

Hint:Convex lens present in the human eye focuses the image of the object on the retina present at its back. The pupil of our eye expands and contracts according to the intensity of light falling on it, that is if the intensity of light is low, it will expand and if it is high, it will contract.

Complete step by step answer:
Our eye has a lens which focuses the image of the object on our retina as a result of which we can see a clear picture. If we consider the distance between the screen and our eyes is very short, the lens of our eyes will not be able to curve enough so that it can focus the image of the screen on the retina. Due to which the image formed on the retina will be a blurred image causing strain to our eyes.

Another reason for the given statement is when the distance between the eyes of the person watching a movie in a cinema hall and screen of that cinema hall is very small then more intensity of light will be falling on the eyes as a result of which pupil of eyes will contract. Due to the contraction of pupil strain will be caused to the eyes of the person watching the movie.

Therefore, We can say if we are watching a movie from a shorter distance of the screen in a cinema hall, we will experience the blur image formation of the content playing on screen and strain our eyes. Hence we cannot enjoy watching a movie from a very short distance in the cinema hall.

Note: We have to take into account both the factors causing strain to eyes that are due to the contraction of the pupil because of the high intensity of light and blur image formation on the retina. Taking into account only one reason will lead to a partially correct answer.