Blue Magic. What is the thinnest film ( = 1.49) on pure flint glass ( = 1.62) for which a blue light of wavelength = 475 [nm] is strongly reflected?

You are gone! An argon laser light with wavelength of 454.6 [nm] is sent through a 0.800 [mm]-wide single slit. A diffraction pattern is observed on a screen 1.15 [cm] from the slit. What is the width of the central maximum of the diffraction pattern?

Cancel culture. You want to coat the surface of a glass ( 1.50) with a thin film to cancel red light with wavelength 675 [nm], and the reflected lights have a half-cycle phase shift. If the thinnest film is 184 [nm], what is the refractive index of this film?

Side to side. A diffraction pattern is produced by a 650. [nm] He-Ne light entering a slit of width 0.200 [mm]. This pattern is seen on a screen 1.68 [m] away. How far is the 5th dark fringes from the each other?

Face dip. Two coherent sources and emit identical sound waves of wavelength 3.28 [m]. An observer is located 2.00 [m] from and 5.00 [m] from . What is the phase difference (in degrees) between these two waves at the location of the observer?

Walo hanggang dulo. Which of the following diffraction intensity plots corresponds to a light beam that is diffracted by eight slits of finite width?

I heard enough. Two identical speakers which are 12.50 [m] apart are emitting sound waves with wavelength 20.10 [m]. An observer stands along the line between the two speakers, as shown in the figure. The observer wants to hear the sound as quiet as possible but should be as close as possible to the left speaker. What should be the distance of the observer from the left speaker?

Type kita! Consider two speakers that are on the -axis at -3.00 [m] and 5.00 [m]. They emit identical and in-phase sound waves of wavelength 1.60 [m]. What type of interference occurs at -1.00 [m]?

Hindi ito Lenz's Law. Consider a thin lens made of Pyrex ( 1.47). The two radii curvature of the surfaces of the lens have magnitudes as shown in the figure. If an object is placed 30.0 [cm] in front of it, in front of it, how many times is the image larger than the object and what is its nature?

2in1. A diverging lens ( 4.00 [cm]) and a converging lens ( 5.00 [cm] ) are placed 5.00 [cm] apart and an object is placed 15.0 [cm] on the left side of the diverging lens as shown. Where is the final image formed?