While performing the experiment to detemine the focal length of a convex lens by using the sun as the distant object, a student could not find a screen with stand. In the absence of a good screen, which of the following method is the most appropriate and safe to be used by the student ?

Options

A. He should focus the image of the sun on his hand
B. He should focus the image of the sun on his nylon shirt
C. He should focus the image of the sun on a wall of the room
D. He should focus the image of the sun on a carbon paper

Answer

C

Explanation

NA