A dentist uses a mirror in front of a decayed tooth at a distance of – InterviewSolution

1.	A dentist uses a mirror in front of a decayed tooth at a distance of 4cm from the tooth to get a 4 times magnified image. Use mirror formula to find the focal length of the mirror used. Is m=+4 or m= -4? How do we know?
Answer» A dentist uses a mirror in front of a decayed tooth at a distance of 4cm from the tooth to get a 4 times magnified image. Use mirror formula to find the focal length of the mirror used. Is m=+4 or m= -4? How do we know?

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