A student performed the experiment of de...

A student performed the experiment of determination of focal length of a concave mirror by `u-v` method using an optical bench of length 1.5 meter. 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),(60,40),(66,33),(78,39)` . The data set (s) that cannot come from experiment and is (are) incorrectly recorded, is (are)

(42, 56)

(48, 48)

(66, 33)

(78, 39)

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The correct Answer is:

C, D

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In the experiment to determine the focal length of a concave mirror by graphical methods the u - v graph is:

A straight line

A circle

An ellipse

None of these

minimum when `u = f` and maximum when `u= infty`

minimum when `u = infty` and minimum when `u = f`

minimum when `u= 0` and maximum when `u= 2f`

minimum when `u = 2f` and maximum when `u =0`

between the object and the mirror only

between the screen and the mirror only

between the object and the screen only

between the screen and mirror as well as between the screen and the object