In order to determine the focal length of a concave mirror, a student obtained a sharp image of the grill of a window in the laboratory wall on a screen. His teacher suggested that to get better result for focal length, he should focus a distant tree instead of the window grill. In which direction should the mirror be moved for for this purpose so as to get a sharp image of the tree on the screen ?

Options

A. behind the screen
B. away from the screen
C. towards the screen
D. very far away from the screen

Answer

C

Explanation

NA