Correct Option: D

The maximum distance of a person from the theatre area should not exceed 400 times the size of the smallest letter or digit being written. Suppose the smallest letter is 2.5 cm the maximum distance of the student should not exceed 400 × 2.5 = 1000 cm i. e. 10m. Viewing range for projection screen: Distance from screen should not be less than twice nor more than six times the width of screen image. Optimum viewing angle should not be more than 30° or 150° from eye level. Suppose the screen image width is 1.5 m then the closest viewer should be at 3 m and farthest at 9 m. Closest answer is 140°.