Sumeet a 5^th class student observed a coloured film of oil on water when illuminated by white light. He felt happy and surprised to see this. His teacher explained him the reason behind it. The child then gives an example of spreading of kerosene oil on water to prevent malaria and dengue.
(i) What value was displayed by his teacher?
(ii) Name the phenomenon involved.

Ravi is using yellow light in a single slit diffraction experiment with slit width of 0.6mm. The teacher has replaces yellow light by x-rays. Now he is not able to observe the diffraction pattern. He feels sad. Again he teacher replaces x-rays by yellow light and the diffraction pattern appears again. The teacher now explains the facts about the diffraction and 
Which value is displayed by the teacher.
Give the necessary condition for the diffraction.

Two boys, on their way from school were discussing seriously about something. They both were blowing soap bubbles and were thrilled to watch the expanding bubble with spectacular colour rings. Rita, a class XII student, was watching them for a long time, walking behind them. Suddenly she realised that the kids did not look at the traffic in that junction area. She rushed to them and instructed them to be cautious while on the road. She also explained the importance of traffic rules and told them that obeying traffic rules not only makes us safe but also others safe.
(i) What are the values highlighted by Rita
(ii) why are colours formed on bubbles?