Question

Tell the definition of all the following
A: focal point
B: object distance
C: magnification
D:height of image
E: height of object
F: virtual image
G:real image

Answer 1

The point at which maximum no.of reflected rays meet called focal point.
The distance from object to pole is called object distance.
The ratio of size of the image to the size of the object is called magnification.
The size if the image formed is called height of the image.
The size of the object is called height of the object.
The image formed by extending the rays is called virtual.
The image formed by not extending the rays is called real image.

Answer 2

Focal point-It is also called focus of mirror or lens. The point where all rays parallel to principal axis converge or appear to diverge.

Object Distance-It is the distance of object from the pole or optical center whose image we want

Magnification-It is the order of largeness of image w.r.t object or ratio of height of image and height of object

Height of image is the perpendicular distance of object top from principal axis
and same goes for height of object.

Virtual image is image which cannot be obtained on screen
Real image is image which can be obtained on screen