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PHYSICS

JAMB 2020 - Question 22

Physics 2020 JAMB Past Questions - Question 22: The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

Choose the correct answers from the options given.

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 leght 10cm

C: convex mirrow of focal length 5cm

D: convex mirrow of focal length 20cm

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Correct Answer

Explanation

F = r/2 = Diameter /4; i.e = 20/4 = 5cm
The polished portion of the hollow metal sphere will form a concave surface.