definitions of the terms related to spherical mirror .
Answers
Answer:
Terms Related to Spherical Mirrors
“Mirror, mirror on the wall, who’s the fairest of them all?” We’ve all heard this dialogue from the story of Snow white and the seven dwarfs. But what kind of mirror was it? What were the properties that enabled these spherical mirrors to be so special? Well, let us find answers to it in this section.
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
Explanation:
TERMS RELATED TO SPHERICAL MIRROR :
SPHERICAL MIRROR :
A spherical mirror is a piece cut out of a spherical surface for reflecting light . There are two types of spherical mirrors :
°Concave lens
°Convex lens
CENTRE OF CURVATURE :
The centre of the sphere, whose part is the length surface , is called the centre of curvature of that surface of the lens .
RADIUS OF CURVATURE :
The radius of the sphere , whose part is the length surface, is called the radius of curvature of that surface of the lens .
PRINCIPAL AXIS :
It is the line joining the centres of curvature of the two surfaces of the lens .
OPTICAL CENTRE :
It is a point on the principal axis of the lens such that a ray of light passing through this point emerges parallel to its direction of incidence.
PRINCIPAL FOCI :
A light can enter a lens from either of the two sides , this is known as a principal foci.
FOCAL LENGTH :
The distance of focus from the optical centre of a lens is called its focal length.
FOCAL PLANE :
A plane normal to the principal axis, passing through the focus, is called the focal plane.