Pole: The centre of the reflecting surface of a spherical mirror. It lies on the surface of the mirror. The pole is usually represented by the letter P.
What is pole of a mirror Class 10?
Pole: It is the center of the reflecting surface of the concave mirror also called vertex of mirror, generally denoted by letter ‘P’. Center of curvature: It is the center of that sphere of which the concave mirror forms a part, denoted by letter ‘C’.
What is meant by pole in physics?
Pole is the point at the middle of the spherical mirror. The point where the principal axis pierces the mirror is called the pole of the mirror. The pole is usually represented by the letter P. The straight line joining the pole (P) and the centre of curvature is the Principal Axis.
What is pole in optics?
Pole of a mirror is the geometrical center of the spherical surface of the 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 pole in lens?
(Opt.) the point where the principal axis meets the surface.
What is pole in motor?
The pole count of a motor is the number of permanent magnetic poles, north and south, on the rotor. There is always the same number of north and south poles on the rotor. For example, in a 12 pole motor, there are 6 north poles and 6 south poles. This motor would also be considered a 6 pole-pair motor.
Where is pole of a mirror?
The Pole of a spherical mirror (convex or concave) is the center of the reflecting surface of the spherical mirror. It lies on the surface of the spherical mirror. It is denoted by the alphabet ‘P’.
What is pole and focus?
It is normal to the mirror at its pole. Aperture: The diameter of the spherical mirror is called its aperture. The reflecting surface of the mirror. Focus: The point of the principal axis at which the rays parallel to principal axis meet (concave mirror) or appear to meet (convex mirror) after reflection.
What is concave mirror Class 10?
1)Concave Mirror:A spherical mirror whose reflecting surface is curved inwards ie faces towards the centre of sphere.
What is Focus point Class 10?
Focus – The point on the principal axis at which the incident rays which are parallel to the principal axis, meet after reflection from the mirror is called focus.
What is pole in refraction?
Pole : Pole of a spherical refracting surface is the centre of the surface. b. Centre of curvature: Centre of curvature of a refracting surface is the centre of the sphere of which this surface is a part.
What is the meaning of Pole in light?
: a lamp that consists of a pole to which light fixtures are attached and that usually extends from floor to ceiling.
What is focal length class 10th?
The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length. It is the point where parallel rays of light meet or converge.
What is pole in concave lens?
Answer: pole -The geometrical center of convex or concave mirror where the principal axis meets the mirror surface is called pole.
Do lenses have pole?
The centre of the spherical refracting surface of the lens is called the pole. The point where the principal axis meets the surface of the lens. The point on the principal axis at the centre of the lens is called Optical centre. A lens has two spherical surfaces, these two spherical surfaces form a part of a sphere.
What is radius of curvature class 10th?
The radius of curvature is the radius of sphere formed by the convex or concave mirror. It is also equal to the distance between the pole and centre of curvature. The sign convention for focal length and radius of curvature is the same.
What is pole and phase in motor?
Phases refer to the power supply phases (one or three) and poles refers to the number of windings (North or South) per phase of the motor.
How do you check a motor pole?
The formula is n = 60 x f /p where n = synchronous speed; f = supply frequency & p = pairs of poles per phase. The actual running speed is the synchronous speed minus the slip speed.
How do you tell if a motor is 2 pole or 4 pole?
On an induction motor, the number of poles determines the speed given the frequency of the power. For a 2 pole motor, at 60hz, it will spin 60 times a second, or 3600rpm. For a 4 pole motor, the speed is halved – 1800 rpm, 6 pole, 1200 rpm and so on.
What is real 10th image?
Real image : If a beam of rays starting from a point source of light, after reflection or refraction, actually converge to a point, then the second point is called the real image of the first. Real image can be captured on a screen. Real images are usually inverted. The images formed on a cinema screen are real images.
What is the name given to the centre of the mirror Class 10?
Grade 10. The vertex is the geometric centre of the mirror. Midway between the vertex and the center of curvature is a point known as the local point; the local point is denoted by the letter F in the diagram below.
Contents