Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given below:
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Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the .png" width="80%"> <br> The correct value for focal length will be obtained by the student
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