When Puja, a student of 10th class, watched her mother washing clothes in the open, she observed coloured soap bubbles and was curious to know why the soap bubbles appear coloured. In the evening when her father, an engineer by profession, came home, she asked him this question. Her father explained to her the basic phenomenon of physics due to which the soap bubbles appear coloured. (a) What according to you are the values displayed by Puja and her father? (b) State the phenomenon of light involved in the formation of coloured soap bubbles.