The inside portion of part of a hollow metal sphere of di...
The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?
concave mirror of focal length 5cm
concave mirror of focal length 10cm
convex mirror of focal length 5cm
convex mirror of focal length 10cm
Correct answer is C
Concave Mirror: It is a spherical mirror whose outer surface is polished and inner or concave side is reflecting surface.
Convex Mirror: It is a spherical mirror whose inner surface is polished and outer side or convex side is the reflecting surface.
f = m4 = f = d4
f = 204 = 5cm