Question

Four students A, B, C and D performed an experiment to determine the focal length of a concave mirror by using a lighted candle kept at a considerable distance as the object. They represented the position of image by drawing the following diagrams:



Which diagram describes the correct position of the image of the candle?
(1) A
(2) B
(3) C
(4) D

Answer 1

In order to determine the focal length of the mirror, students need to obtain the image at the focal point of the mirror. So, in the above experiment, the image should form at the focus.

Hence, the correct answer is option 4.