A student performed the experiment of determination of focal length of a convex mirror by u-v method length of the mirror used is 24cm. The maximum using an optical beneath of length 1.5m . The focal error in the location of the image can be 0.2cm. The 5 sets of (u,v) values recorded by the student (in cm) are (42,56), (48,48), (60,40), (66,33), (78,39). The data set (s) that cannot come from experiment and is (are) incorrectly recorded, is (are):

A student performed the experiment of determination of focal length of

1.	A student performed the experiment of determination of focal length of a convex mirror by u-v method length of the mirror used is 24cm. The maximum using an optical beneath of length 1.5m . The focal error in the location of the image can be 0.2cm. The 5 sets of (u,v) values recorded by the student (in cm) are (42,56), (48,48), (60,40), (66,33), (78,39). The data set (s) that cannot come from experiment and is (are) incorrectly recorded, is (are):
Answer» `(42,56)` `(48,48)` `(66,33)` `(78,39)` ANSWER :C::D

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