why is studying mirror related terminologies important
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Answer: Basic Terms Related to Image Formation by Spherical Mirror
Centre of curvature (C): Centre of the sphere of which the mirror is a part.
Radius of curvature (R): Radius of the sphere of which the mirror is a part.
Pole (P/O): Geometric centre of the spherical surface of the mirror.
Principal axis: Straight line joining the pole of the mirror to its centre of curvature.
There’re few basic and important terms one needs to know while studying spherical mirrors inside the chapter “Reflection and Refraction”:
a. Center of Curvature (c)
b. Radius of Curvature (r)
c. Pole (p)
d. Principal axis
e. Aperture
f. Principal Focus or Focal Length
g. Focus
a. Center of Curvature (c) :
The Center of Curvature of a spherical mirror is the point in the centre of the mirror which passes through the curve of the mirror and has the same tangent and curvature at that point. It is denoted by the letter ‘c’.
Explanation: b. Radius of Curvature (r):
It’s the linear distance between Pole and the Center of curvature.
c. Pole (p) :
It’s the midpoint of the spherical mirror.
d. Principal axis:
It’s an imaginary line passing through the optical centre and the centre of curvature of any lens or a spherical mirror.
e. Aperture:
An aperture of a mirror or lens is a point from which the reflection of light actually happens. It also gives the size of the mirror.
f. Principal Focus :
Principal Focus can also be called as Focal Point. It’s on the axis of a mirror or lens wherein rays of light parallel to the axis converge or appear to converge after reflection or refraction. Principal Focus is also what determines the Focal Length of the mirror.
g. Focus:
It’s any given point, where light rays parallel to the principal axis, will converge after getting reflected from the mirror.
What is an Image?
When an object is placed in front of a mirror, we see an image of the object placed. This image appears to be behind the mirror, and is called “Image”. The object is the source from which incident ray occurs and the image that is formed is because of the reflected rays. The image formed maybe “Real” or “Virtual”.
Wherein the “real” image is formed when the light rays from the object actually intersect each other after reflection. Real images are formed inverted and can be projected on to a screen. On the other hand, a “virtual” image is formed when the light rays from the object don’t actually intersect each other after reflection. Although they “appear” to do so when they’re produced behind the mirror. Virtual images are “always” erect and cannot be projected on a screen.
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Key words related to the reading mirror are:
- There are a few basic words that a person needs to know while reading round glasses, and these are:
Curvature Center:
- The point in the center of the mirror passes the curve of the mirror and has the same tangent and curve at the same time.
Radius of Curvature:
- The distance of the line between the pole and the center of the bend.
The main axis:
- An imaginary line that passes between the viewing area and the bending area of any lens or circular mirror.
The stake:
- The center of the circular mirror.
The hole:
- The location of the mirror or lens is the area where light reflection really takes place.
- It also provides a mirror size.
Principal Focus:
- Principal Focus can also be called Focal Point.
- It is in the mirror or lens where the rays of light that accompany the axis meet or appear to collide after exposure or retreat.
Focus:
- Any given point, where the rays of light corresponding to the main axis, will converge after the appearance of the mirror.
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