Question

5. (4x 4-16 pts) Fig. 1 Fig. 2 () A double slit apparatus withd -0.01 mm is illuminated by light (Fig 1). The position of the first maximu m on the screen 2 m away is measured to be 10cm away from the (i) In an ensuing flood, water (n 1.33) fills the laboratory and the apparatus. Does the (ili) After the water was drained, a thin sheet of plastic (n - 1.60) has been placed on one center bright spot. What is the wavelength (in nm) of light in this experiment? position of the first fringe on the screen change and if so by how of the slits (Fig. 2) such that the center point on the screen has became dark. What is the minimum thickness of the plastic? (iv) With plastic in place, what is the postion of the 0-th order fringe (Coe" bright spot) on the screen?

Answer 1

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