If you were going to make your own value scale, how would you do it? Please list the steps that you would take and what kinds of materials you would need to make a value scale.

Achair of height 1 m is placed 1 m in front of a plane mirror. a girl is standing 3 m behind the chairas shown. find the minimum length of the plane mirror in order that she can see the whole imageof the chair.a. 0.50 mb. 0.75 mc. 0.80 md. 1.00 m