Question

16. With the help of suitable ray diagram explain image formation of point and extended object by plane mirror.
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Answer 1

Answer:

Solution:

The length of mirror is the distance between points A and B.

To see the bottom most point of himself, the boy of height H needs to have mirror at least at a distance of  

2

H  from the bottom.Thus the point B is established.

Also to see the top most point of his father, the child must have a point of mirror at a distance x from a point directly in front of him such that,  

H−x

2l  =  xl

​ ⟹x= 3

H

Hence the minimum length of mirror required=  

2

H  +  3

H  =  6

5H

Diagram: