1.

An object placed between the pole and focus of a concave mirror produced a virtual and enlarged image. Explain this using mirror formula.

Answer»

Solution :According to the spherical mirror FORMULA
`(1)/(v)+(1)/(U)=(1)/(f)`
`(1)/(v)=(1)/(f)-(1)/(u)`
`(1)/(v)=(u-f)/(uf)`
For a CONCAVE mirror, f = - ve and u = - ve,
It is given that `u lt f` so v is positive.
Since `v gt 0` i.e. positive and `u lt 0` i.e. negative.
Therefore, image FORMED is BEHIND the mirror [virtual].
`m=-(v)/(u)`
`m=-((+v))/((-u))` therefore m is + ve and the image is enlarged.


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