a dentists mirror has a radius of carvature of 3cm. how far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified five times?
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R = 3cm,
f =- 3/2 = -1.5cm
( Negative sign for cancave mirror)
m = 5
We know that m= - v/u
Therefore (-5u) =( v)
Using (1/v) + (1/u) = (1/f )
(1/-5u) + ( 1/u) = (1/-1.5)
Therefore, (5u /4) = -1.5
Thus, u = -1.2 cm
The object should be placed at a distance of 1.2cm from the mirror to get 5 times magnified image.
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f =- 3/2 = -1.5cm
( Negative sign for cancave mirror)
m = 5
We know that m= - v/u
Therefore (-5u) =( v)
Using (1/v) + (1/u) = (1/f )
(1/-5u) + ( 1/u) = (1/-1.5)
Therefore, (5u /4) = -1.5
Thus, u = -1.2 cm
The object should be placed at a distance of 1.2cm from the mirror to get 5 times magnified image.
I HOPE IT WILL HELPFUL TO YOU
PLS MARK AS BRAINLY ANSWER
prashant603041:
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