A student performed the experiment of determination of focal length of a concave mirror by u-v method using an optical bench of lingth 1.5 meters. the focal length of the mirror is used is 24 cm. The maximum error in the location of the image can be .2 cm. The 5sets of (u,v( values recorded by the student in cm are (42,56), (48,48), (66,33) , (78,39)
The data set(s) that cannot come from experiment and is(are) incorrectly recorded is(are)
A) (42,56)
B) (48, 48)
C) (66,33)
D) (79,39)
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62[url=http://iitjee2009solutions.targetiit.com]Solution Key with Question Paper of 2009 IIT JEE[/url]