A dentist uses a small concave mirror of focal length 3 cm and hold it at a distance of 2 cm from the tooth. Which of the following statement is incorrect about the image formed?
A
The image is three times the size of the object.
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B
The distance between the object and the image is 8 cm.
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C
The image distance is -6 cm from the pole.
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D
The image formed is erect.
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Solution
The correct option is C The image distance is -6 cm from the pole. Given :
Focal length, f=−3cm
Object distance, u=−2cm
Using mirror formula, 1f=1v+1u 1-3=1v+1-2 v=6cm
Magnification=hiho−vu=−6−2=3
Image formed is three times of the object size and it is virtual and erect.