Question

What is meant by magnificantion? Write its expression. What is its sign for the (a) real and (b) virual image?

ICSE Class 9 Physics Chapter Reflection of Light

Answer 1

if the lenght of the object and the image are measured perpendicular to the principal axis, the ratio of length of the image to the length of the object is called magnification. ..if length of image is I and that of the object is O,then magnification = I/O = distance of image (v)/ distance of object (u) or m= I/O = -v/u...a) u and v both are negative, so linear magnification is negative. .A real image is always inverted. ...b) u is negative while v is positive,so linear magnification is positive,...A virtual image is always erect. ..