A student performed the experiment of determination of focal length of a concave mirror by (u-v) method using an optical bench of length `1.5m`. The focal length of the mirror used is `24 cm`. The maximum error in the location of the image can be ` 0.2 cm`. The 5 sets of (u,v) values recorded by the student (in cm) are `(42,56), (48,48),(60,33),(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) `(78,39)`.

Options

A. `(42,56)`
B. `(48,48)`
C. `(66,33)`
D. `(78,39)`

Answer

C, D