Sage-Tips

What is the geometric center of a spherical mirror called?

Pole
Pole: Pole is the point inside the spherical mirror which is the geometrical center.

Why a concave mirror does not reflect all rays parallel to its optical axis through its focal point?

Incident rays parallel to the optical axis are reflected from the mirror and seem to originate from point F at focal length f behind the mirror. Thus, the focal point is virtual because no real rays actually pass through it; they only appear to originate from it. Figure 2.8 Reflection in a concave mirror.

What is the difference between pole and centre of curvature?

Pole – The geometric centre of the mirror is called pole. Centre of curvature – It is the centre of the hollow sphere which the mirror forms a part. It is represented by C. Radius of curvature – It is the radius of the hollow sphere of which the mirror is a part.

How is principal axis normal to the mirror at its pole?

ii)a straight line passing through the pole and the centre of curvature(C) is called principal axis. so we can say that principal axis is normal to the mirror at its pole because it passes through the centre of curvature because of that we can say that it passes through the radius also.

Is the geometrical centre of the mirror?

The vertex is the geometric center of the mirror.

What is the distance between the focus and the pole of the mirror is known as?

The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature.

What are the reflection rules for concave mirrors and convex mirrors?

Guidelines for Rays Falling on the Concave and Convex Mirrors

• When a ray strikes concave or convex mirrors obliquely at its pole, it is reflected obliquely.
• When a ray, parallel to principal axis strikes concave or convex mirrors, the reflected ray passes through the focus on the principal axis.

What are the two rules of reflection for concave mirrors?

Any incident ray traveling parallel to the principal axis on the way to the mirror will pass through the focal point upon reflection. Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principal axis upon reflection.

Is centre of curvature part of a mirror?

Center of curvature is not part of the mirror, rather it lies outside the mirror. Concave mirror and convex mirror can be formed from a single spherical glass by slicing it but polishing both the slices in the opposite manner.

What is pole centre of curvature principal axis?

(c) Pole: The centre of a spherical mirror is called its pole. (d) Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.

Is principal axis normal to pole?

A straight line passing through the pole and the centre of curvature of a spherical mirror. Principal axis is normal to the mirror at its pole.

What is principal axis of mirror?

Principal axis is the straight line that joins the pole of the mirror to its center of curvature. Center of curvature of mirror is the center of the sphere of which the mirror is part of.

What is the pole of a spherical mirror?

what can be a suitable definition to a pole of the spherical mirror. It cant be the geometrical center of a spherical mirror as if a mirror is cut then its pole does not change. moreover if a spherical mirror is cut into two parts then it does not have two poles. The point where the principal axis pierces the mirror is the pole.

What is the point where the principal axis of a mirror?

The point where the principal axis pierces the mirror is the pole. And this principlal axis can be any normal to the surface. It is what we assume according to our convenience.

What is the center of curvature of a mirror?

The vertex is the geometric center of the mirror. Midway between the vertex and the center of curvature is a point known as the focal point; the focal point is denoted by the letter F in the diagram below. The distance from the vertex to the center of curvature is known as the radius of curvature (represented by R ).

What happens when a concave mirror is placed close to an object?

When the concave mirror is placed very close to the object, a virtual and magnified image is obtained and if we increase the distance between the object and the mirror, the size of the image reduces and real images are formed. These real images can be projected on a screen.