The Light is reflected from the bottom of a glass tray (n_glass = 1.66) containi

Question

The Light is reflected from the bottom of a glass tray (n_glass = 1.66) containing water (n_water = 1.33). The Brewster's angle for this reflected light is a. 58.9 degree b. 51.3 degree c. 38.7 degree d. 31.1 degree e. None of the above Find the maximum wavelength of light that can cause photoelectric effect in Lithium (Work Function -2.5eV a. 531mm b. 681nm c. 497nm d. 589nm e. None of the above An object is placed 30cm from a concave mirror giving a virtual image twice the size of the object. The focal length of the mirror is a. 60cm b. -20cm c. 20cm d. -30cm e. None of the above An electron microscope uses an electron beam of 100KeV energy. The corresponding de-Broglie wavelength is a. 0.122 times 10^-10 m b. 0.039 times 10^-10 m c. 0.39 times 10^-10 m d. 1.23 times 10^-10 m e. None of the above Two rocket ships approach the earth from opposite directions with a speed of 0.8c relative to the earth. What is the speed of one ship relative to the other a. 0.98c b. 0.6c c. 0.55c d. 0.15c e. None of the above The phase angle of an RL circuit is 76 degree at a frequency of 60Hz. If R = 2.7 ohm, what is the value of the inductor a. 11.16H b. 0.31H c. 0.25mH d. 0.029H e. None of the above

Explanation / Answer

here,

1)

n1 = 1.66

n2 = 1.33

the Brewster's angle , theta = arctan(n2/n1)

theta = arctan(1.33/1.66)

theta = 38.7 degree

the Brewster's angle is c) 38.7 degree

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