A dentist uses a mirror in front of a decayed tooth at a distance of 6

1.	A dentist uses a mirror in front of a decayed tooth at a distance of 6 cm from the tooth to get a four times magnified image.
Answer» Answer: object distance, u = -4 cm magnification, m= 4 we know, m = -V/u ⇒ v = -mu ⇒ v = -(4)(-4) = 16 cm so image distance= 16 cm now, by mirror formula , 1/v + 1/u = 1/f ⇒ 1/16 + 1/-4 = 1/f ⇒ (1-4)/16 = 1/f ⇒ 1/f = -3/16 ∴ focal length = - 5.33 cm only a CONCAVE mirror can FORM magnified images. since, the image is FORMED behind the mirror, it is virtual and erect Step-by-step explanation:

A dentist uses a mirror in front of a decayed tooth at a distance of 6 cm from the tooth to get a four times magnified image.

Answer»

Answer:

object distance, u = -4 cm

magnification, m= 4

we know, m = -V/u ⇒ v = -mu ⇒ v = -(4)(-4) = 16 cm

so image distance= 16 cm

now, by mirror formula ,

1/v + 1/u = 1/f

⇒ 1/16 + 1/-4 = 1/f

⇒ (1-4)/16 = 1/f

⇒ 1/f = -3/16

∴ focal length = - 5.33 cm

only a CONCAVE mirror can FORM magnified images.

since, the image is FORMED behind the mirror, it is virtual and erect

Step-by-step explanation:

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A dentist uses a mirror in front of a decayed tooth at a distance of 6 cm from the tooth to get a four times magnified image.​

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A dentist uses a mirror in front of a decayed tooth at a distance of 6 cm from the tooth to get a four times magnified image.