Question

1. Which of the following is not a condition for constructive interference when light waves from...

1. Which of the following is not a condition for constructive interference when light waves from two sources meet at a point?

a. the path difference is one wavelength

b. the intensity is maximum

c. a bright fringe is formed

d. a crest meets a crest

e. All of the choices are conditions for constructive interference

2. Coherent light of wavelength 500 nm is incident on two parallel slits separated by 0.08 mm. On a very distant and large screen, what is the total number of bright fringes that can be formed?

a. 160 bright fringes

b. 320 bright fringes

c. 321 bright fringes

d. 81 bright fringes

e. 161 bright fringes

3. Light rays travels from air (n = 1.00) to water (n = 1.33) at an angle of incidence of 30 degrees. Most of the light rays are refracted but some reflected. What is the angle between the reflected and refracted rays?

a. 75 degrees

b. 109 degrees

c. 55 degrees

d. None of the choices is correct.

e. 128 degrees

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