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 basic phenomenon of physics due to which bubbles appear coloured.
(a) What according to you are the values are the displayed by puja and her father?
(b) State the phenomenon of light involved in the formation of coloured soap bubbles.

Anil is using yellow light in a single slit diffraction experiment with of 0.6 mm. When his friend replaced yellow light by X-rays then diffraction pattern is not visible.they became surprised and asked the teacher about such thing.The teacher replaces X-rays by yellow light and diffraction pattern appears again. The teacher explained all the facts about diffraction properly.
(a) What are the values noticed in both the students?
(b) Give the necessary condition for the diffraction?
(c) Why is diffraction pattern not visible by using X-rays in such case?

Two students are situated in a room 10 m high, they are separated by 7 m high partition wall. the students are unable to see each other even though they can converse easily. But they know that both light and sound waves can bend around the obstacles. So they were phenomena. Then they went to their friend Neelam who convinced them with basic facts.
(a) what are the values shown by Neelam?
(b) How did Neelam convince them such basic facts?

During summer vacation Radha and Rani decided to go for a 3 FILM. They have heard about this film through their friends. They were asked to buy special glasses to view the film. Before they go for a movie, they approached their Physics teacher to know about these glasses. Physics teacher explained when two polarizer's are kept perpendicular to each other (crossed polarizer's), the left eye sees only the image from the left end of the projector and the right eye sees only the image from the right lens. The two images have the approximate perspectives that the left and right eyes would see in reality the brain combine the image to produce a realistic 3-D effect
(a) What qualities do these girls possess?
(b) What do you mean by polarization?
(c) Mention the other applications of polarization. 

School arrange an educational trip to Kavalur in Tamil Nadu where an observatory having Indias largest telescope. On hearing this, the whole class  got excited and left for their way to kavalur. In the observatory, the physics teacher' was explaining about the type of telescope, with diameter of objective (2.34 m) and several other details. Everyone was ready to look through the telescope.
(i) What type of telescope is the teacher referring to?
(ii) Mention any two advantages of this telescope
(iii) Why are such a field trips important?