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In some observation the observed object distance (Separation between indicos of object needle and mirror) is `30.2 cm` and the observed imager distane is `19.9cm` Using index correction from previous two questions estimate the focal length of the concave mirror .

Text Solution

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`u = 30.2 - 0.2` (excess readin)
`= 30.0 cm`
`v = 19.9 - (-0.1)` (excess reading)
`-= 20.0cm`
`(I)/(f) = (1)/(v) + (1)/(u) rArr f = 12.0 cm` .
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