Question on: JAMB Physics - 2024
An object is placed 25 cm in front of a convex mirror and has its image formed 5 cm behind the mirror. What is the focal length of the convex mirror?
A
8.20cm
B
6.25cm
C
5.60cm
D
4.50cm
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Correct Option: B
Using the mirror formula: 1/f = 1/v + 1/u
Given: u = -25 cm (object distance, negative for mirrors), v = 5 cm (image distance, positive for convex mirrors)
Plug in values: 1/f = 1/5 + 1/(-25) = 0.2 - 0.04 = 0.16
Thus, f = 1 / 0.16 ≈ 6.25 cm
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