Optics 1 Question 12

12. A student performed the experiment of determination of focal length of a concave mirror by uv method using an optical bench of length 1.5m. The focal length of the mirror used is 24cm. The maximum error in the location of the image can be 0.2cm. 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)

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Answer:

Correct Answer: 12. (c, d)

Solution:

  1. Values of options (c) and (d) don’t match with the mirror formula.

1v+1u=1f



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