Optics Ques 14
- A student performed the experiment of determination of focal length of a concave mirror by $u-v$ method using an optical bench of length $1.5$ $ m$. 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)
(2009)
(a) $(42,56)$
(b) $(48,48)$
(c) $(66,33)$
(d) $(78,39)$
Show Answer
Answer:
Correct Answer: 14.(c, d)
Solution:
Formula:
- Values of options (c) and (d) don’t match with the mirror formula.
$ \frac{1}{v}+\frac{1}{u}=\frac{1}{f} $
BETA
