Question

A student performs an experiment to find the focal length of a convex mirror. The image formed in this case would be ​

Answer 1

Answer:

66,33) and (78,39)

Explanation:

For the given concave mirror: f=−24 cm

Mirror formula is

v

1

+

u

1

=

f

1

so, v=

u−f

uf

Case 1: u=−42 cm,

v=

−42+24

−24×(−42)

=−56 cm

Satisfies

Case 2: u=−48 cm

v=

−48+24

−24×(−48)

=−48 cm

Satisfies

Case 3: u=−66 cm

v=

−66+24

−24×(−66)

=−37.71 cm

Does not satisfy

Case 4: u=−78 cm

v=

−78+24

−24×(−78)

=−34.66 cm

Does not satisfy

Therefore incorrectly recorded data set are (66,33) and (78, 39)