The inside portion of part of a hollow metal sp... - JAMB Physics 2021 Question
The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?
A
concave mirror of focal length 5cm
B
concave mirror of focal length 10cm
C
convex mirror of focal length 5cm
D
convex mirror of focal length 10cm
correct option: a
f = \(\frac{m}{4}\)
= \(\frac{d}{4}\)
= \(\frac{20}{4}\)
= 5cm
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