What type of mirror do dentists usually use to clearly see the images or our teeth? why?

Concave mirror is a type of mirror that is used by dentists to clearly see images of our teeth because they form an erect and enlarged image of the teeth.

Keywords: Concave mirrors, upright and enlarged image  

Level: High school  

Subject: Physics  

Topic: Curved mirrors  

Sub-topic: Concave mirrors  

The dentists make use of the Concave Mirrors to obtain the clear and magnified image of the teeth.

Further Explanation:

The dentists need to obtain the clean and magnified image of the teeth while operating or examining the teeth. The mirror is held by the dentist very close to the teeth so that the image could be as clear as possible.

Since the mirror is placed very close, the object for the mirror i.e. the teeth lies at the distance almost less than that of the focal length of the mirror. Now the mirror held by the dentist should be such that it forms the magnified and erect image of the object placed between the focus and the pole of the mirror used by the dentist.

Image Formation:

The erect and magnified image for the object placed at the distance less than the focal length of mirror is only formed by the concave mirror. A concave mirror forms a virtual, magnified and erect image of the teeth so that the dentist can have a clear look at the teeth.

The ray diagram for the image formation of the teeth by the dentist’s concave mirror is attached below:

Examples:

The concave mirror is used in several other applications where it is used to disperse the light incident on it and form a magnified image.

•  The concave mirrors are used in the headlights of the vehicles in order to reflect the light and form a strong beam of light by focusing the light after reflection.

•  The concave mirrors are used as the mirrors to form the large magnified images of the object to view them clearly. For ex: the shaving mirror, a dentist’s mirror etc.

Thus, the dentist uses a concave mirror in order to obtain the clean and magnified image of the teeth.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Spherical Mirrors

Keywords:

Dentist, mirror, image, teeth, magnified, clear, concave mirror, reflect, focus, erect, close, pole, virtual image, focal length, image formation.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.