5. (4 pts) Two in-phase antennas, surrounded by air, act as point sources for mi

Question

5. (4 pts) Two in-phase antennas, surrounded by air, act as point sources for microwaves with a wavelength of at 40 cm. They are positioned on the x axis at x cm. You place a detecting antenna at point P, which is h3.0 (cm) (x 430 cm, y -8.0 cm) Which of the following is true? (a) The interference at this point is maximum constructive. (b)The interference at this point is maximum destructive. Antenna t Antenna (c) The interference at this point is exactly halfway between (cm) maximum constructive and maximum destructive. (d) None of the above. 6. (4 pts) After completing a calculation, you find d, +5.0 cm and d 2.0 cm. From this, you can tell that the (a) real and upright (b) real and inverted (c) virtual and upright. (d) virtual and inverted 7. (4 pts) An unpolarized beam of light with an intensity of992 w/m passes through two polarizing filters. The first has its axis at 569 counterclockwise from horizontal. The second has its axis at 25.8° counterclockwise from horizontal. What is the intensity after passing through both polarizers? (a) 16.0 W/m (b) 131 (c) 182 w/m2 240 W/m (e) 364 W 496 W 8. (4 pts.) The index of refraction of a material depends on the wave oflight. As a result, length (a) images formed by mirrors are degraded by spherical aberration. (b) images formed by mimors are degraded by chromatic aberration. (c) images formed by mirrors are degraded by diffraction. (d) images formed by lenses are degraded by spherical aberration. (e) images formed by lenses are degraded by chromatic aberration. (f images formed by lenses are degraded by diffraction.

Explanation / Answer

5. None of above.

Here the angle between the waves is not 0 or 90. So the interference has a state that is not constructive or destructive.

6. Real and inverted

The positive value corresponds upright, real and the negative value corresponds contrary

7. Answer do

Malu' law.. intensity of polarised light=I ( cos square x)... x=angle..I=initial intensity

8. Refraction is related with lenses.

Image formed by lenses are degraded by diffraction

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