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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 . |
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Answer» `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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