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swati chaudhary

· started a discussion

· 1 Months ago

option is incorrect (Question: 188751.0 )

focus is infinite
radius = 1 / focus
radius = 0

Question:

The radius of curvature of a plane mirror  –

Options:
A) can be anywhere between zero and infinity
B) is infinity
C) is zero
D) None of these
Solution:
Ans: (b) The radius of curvature of a plane mirror is infinite because every surface is a part of a sphere. So, plane mirror will be part of a sphere of infinite radius.  

Knowledge Expert

· commented

· 1 Months ago

@swati chaudhary The radius determines how much the mirror will curve. If the radius is really small, the mirror will be really curved; if the radius is large, the mirror will be less curved.

Consider how curved a mirror with a radius of curvature the size of a marble would be, versus a mirror with a radius of curvature the size of a beach ball. Now consider how curved a mirror with a radius of curvature the size of the earth--and imagine how flat that would seem if you stood on it.

In fact, the larger the radius of curvature, the flatter the surface will appear. Thus, a perfectly flat surface will occur when the radius of curvature equals infinity.

swati chaudhary

· commented

· 1 Months ago

you are wrong. focus is infinite for plane mirror. and it is clearly mention in NCERT Books of class 10 and 12. i have read in m.sc physics also

Knowledge Expert

· commented

· 1 Months ago

A plane mirror is flat. It won't have any curved surface, consequently. Therefore geometrically the radius is considered as infinite.
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