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A student performed the experiment of de...

A student performed the experiment of determination of focal length of a concave mirrior by (u-v) method using ac optical bench of length `1.5m`. The focal length of the mirrir 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 caome from experiment and is (are) incorrectly recorded, is (are)
(a) `(42,56)`
`(48,48)`
`(66,33)`
`(78,39)`.

Text Solution

Verified by Experts

Values of options ( c) and (d) do not match with the mirror formula,
`1/v+1/u=1/f`.
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