Intensity is a. the lightness or darkness of a color. b. the illumination coming from a light source. c. the brightness or dullness of a color. d. the color's name such as red, yellow, blue.

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