Advertisements
Advertisements
Question
Explain the following terms :
Pole, Centre of curvature, Radius of curvature, Principal axis. Show them on separate diagrams for each of the concave and convex mirrors.
Advertisements
Solution
Pole: “The geometric centre of a spherical mirror is called POLE.”
Concave mirror Convex mirror
“The midpoint of aperture AB of the mirror is called pole.” P is pole of mirror.Centre of curvature: “The centre of a hollow sphere of which the mirror forms a part.” It is represented by the symbol ‘ C ‘
Concave mirror Convex mirror
Radius of curvature: “The radius of a hollow sphere of which the mirror is a part”. It is represented by ‘R’
Concave mirror Convex mirror
Principal axis: “Is a straight line joining the pole of the mirror to its centre of curvature and extended further.”
Concave mirror Convex mirror
APPEARS IN
RELATED QUESTIONS
We can obtain a real, enlarged and inverted image by a concave mirror.
What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?
What is a spherical mirror?
How is the focal length of a spherical mirror related to its radius of curvature?
(a) When a concave mirror is used as a shaving mirror, where is the person's face in relation to the focus of mirror?
(b) State three characteristics of the image seen in part (a).
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find
- the focal length of mirror
- position of image.
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
Define the following term in relation to concave mirror.
Center of curvature
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
