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
Explanation
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Discussions (33)
but remember it is a metal pip not glass , in metal the side you polish is the side that will reflect. so it cant be C
I expect myschool admins to correct this long ago. the correct option is C. When metals are polished, they become good reflectors. Polished metals are actually shinning metals. POlished metals like silver are good reflectors of heat and light, While dark solid like coal are good absorbers, myschol please correct this now
From the exola below option C is the correct option.
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 whose outer side or convex side is the reflecting surface.
f = m4
= f = d4
f = 204
= 5cm
(For metal, it is the polished side that will be the reflecting surface)
the correct option is C. it is a convex mirror because the inside is polished and the outside surface becomes the reflecting surface
The correct answer is that it is a convex mirror because the inside portion is polished
According to the explanation the answer picked or chosen is wrong. because the explanation states that the inner surface of a convex mrror is polished and the question clearly states that the inside was polished so i think the right answer is option C. im open to corrections. As always
In one examination practice this is the fifth question which is either unclear or apparently incorrect .
