Coherence and Conditions for Interference (TOPIC)

Activity 1: How Is Your Phase? Investigate the following figures and identify if what phase is formed where the two waves of coherent source met. (In-phase or Out-of-phase) 1. 2. 3. 4.\fVALUING Summer is fast approaching. And during summer, We can see a lot of people wearing sunglasses walking down the street especially if not during a pandemic. Why do we usually use sunglasses? Is it just a fad or helps our eyes? Explain your answer https://www.zeiss.com/content by using the concept of interference, reflection, / dam/ vision- and polarization. care/images/products/ consumer / sunlens/ zeiss-sunlens-ar- antireflective-coatings.jpgActivity 1: Light Plus Light Equals Dark Materials: . Laser pointer Lice comb (or, not quite as good, an eyelash comb with narrowly spaced metal teeth)black tape white screen or 5 it? - inch index card two Large hinder clips, 1 inch {2.5 cm] wide, 2 inches {5 cm] long two medium hinder clips, 1f: inch [1cm] wide, 1 inch [2.5 cm] long a single-edge razor blade or straightedge knife Procedure: 1. 2. Use the black tape to cover the teeth on the lice comb, leaving only two elite between adjacent teeth. Insert the handle of the comb into a large hinder clip and set the clip on its side or another at surface so the teeth of the comb are vertical. Clip the two medium hinder clips to the barrel of the laser and position them so the laser pointer rests horizontally. Attach the remaining large hinder clip to the index card so that it creates a stand for the card. Set up the laser pointer and comb so that the laser beam shines through the two open slits on the comb onto the white screen. Position the screen at least 4 feet [1.5 meters] from the two slits. https://www.exploratorium.edu/sites/default/files/TwoSlitExp_DSC_4793_P960.jpg Guide Questions: 1. Turn on the laser pointer. What is formed on the distant screen? 2. Explain the formation of bright and dark bands on the screen. 3. Move the screen closer and farther from the sources. Observe the changes in the pattern which is projected onto the screen. Complete the following sentences. A. As the screen is moved farther from the slits, the distance between the bands (increases, decreases, remains the same). B. As the screen is moved closer to the slits, the distance between the bands (increases, decreases, remains the same). C. The band separation distance (y) and the slit-to-screen distance (L) are (directly, inversely) related