Q4 of 61 Page 63

What is meant by magnification? Write its expression. What is its sign for the

a) real image


b) virtual image


Magnification – magnification is defined as how many times bigger or smaller the image of the object formed by the spherical mirror.


It is defined as the ratio of the height of the image to the height of the object.


Let , height of the object = ho


Height of the image =hi


Then the magnification



Magnification can also be defined as ratio of object distance(u) and the image distance (v)



The sign will be


• negative for real image


• positive for virtual image


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2

Pick out the concave and convex mirrors from the following and tabulate them

Rear-view mirror, Dentist’s mirror, Torch-light mirror, Mirrors in shopping malls, Make-up mirror.


 3

State the direction of incident ray which after reflection from a spherical mirror retraces its path. Give reason for your answer.

 5

Write the spherical mirror formula and explain the meaning of each symbol used in it.

 1

a) Draw ray diagrams to show how the image is formed, using a concave mirror when the position of object is i) at C ii) between C and F iii) between F and P of the mirror.

b) Mention in the diagram the position and nature of image in each case.