1.

The focal length of a plane mirror is

Answer»

0
`OO`
It does not have a FOCAL length
None of the above

Solution :For a PLANE mirror v = -u and so `(1)/(f) = (1)/(v) + (1)/(u) = (1)/((-u)) + (1)/((u)) = 0 RARR f = oo`


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