Question 1 - Diffraction, Effect of window size,
Diffraction for sound and light (English)

Question 2 - Diffraction minima
(English)

Question 4 - Polarisation for mechanical and light waves(English)

Question 5 - Law of malus (English)

Question 6 - Applications of polarised light or polaroids (English)

Question 7 - Methods of polarisation(English)