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Which mirror is used by dentists to see enlarged images of teeth?
Concave
Convex
Plane
Cylindrical
Concave
Dentists use a concave mirror because it produces a magnified and erect image of the tooth when the object is placed between the pole and the focus of the mirror. This allows for a detailed examination of cavities and internal dental structures.
Dentists use a concave mirror because it produces a magnified and erect image of the tooth when the object is placed between the pole and the focus of the mirror. This allows for a detailed examination of cavities and internal dental structures.
Think of it like a makeup or shaving mirror that makes small details easier to see by zooming in on your skin or facial hair.
Concave = Close = Created image is magnified (only when held close).
f1тАЛ=v1тАЛ+u1тАЛ тАФ Mirror formula relating focal length, image distance, and object distance
m=тИТuvтАЛ тАФ Magnification formula where m>1 for a magnified image
When an object is placed within the focal length f of a concave mirror, the light rays diverge after reflection. The reflected rays appear to meet behind the mirror, forming a virtual, erect, and magnified image. This property is described by the mirror formula f1тАЛ=v1тАЛ+u1тАЛ, where v is negative (virtual) and u<f.
A concave mirror converges light rays.
Magnification is positive and greater than 1 when the object is placed between the pole and focus.
The resulting image is virtual and erect.
Enables inspection of hidden or small areas in the mouth
Provides a clear, magnified view of dental anatomy
Magnified view is only possible at a specific close range
Distortion can occur if the object is moved beyond the focal point
Dental examination mirrors
Makeup and shaving mirrors
Head mirrors used by ENT specialists
| Feature | Concave (at close range) | Convex |
|---|---|---|
Nature of Image | Virtual, erect, and magnified | Virtual, erect, and diminished |
A concave mirror has a negative focal length by sign convention.
Option B is incorrect because convex mirrors always form diminished images, making them unsuitable for seeing small dental details.
Option C is incorrect because plane mirrors produce images of the same size as the object.
Option D is not a standard optical mirror type used for clinical magnification.
A is correct тАФ A concave mirror is used by dentists to obtain a virtual, erect, and magnified image of the teeth.
Remember that concave mirrors form real images at distances greater than the focal length, but only virtual images when the object is closer than the focal length!
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