8. Unpolarized light can also undergo polarization by reflection off nonmetallic

Question

8. Unpolarized light can also undergo polarization by reflection off nonmetallic surfaces. The extent to which polarization occurs is dependent upon the angle at which the light approaches the surface and upon the material that the surface is made of. Nonmetallic surfaces such as asphalt roadways, snowfields and water reflect light such that there is a large concentration of vibrations in a plane parallel to the reflecting surface. What type of sun glasses are most useful to sports enthusiasts like fishermen? a. Glasses with unpolarized lenses b. Glasses with lenses polarized in the horizontal direction. c. Glasses with lenses polarized in the vertical direction. d. Glasses with lenses polarized at a 45 degree angle e. Glasses with one lens polarized in the horizontal direction and the other in the vertical direction. 9. For a concave mirror to be used as a "make-up" mirror, the face needs to be placed a. At the focal point distance. b. Inside the focal point distance. c. Beyond the focal point distance. 10. What colored inks are needed to print colored pictures on the printed page? 11.If blue and green lights are used to illuminate objects of many colors, objects that are andwill appear to be black. 12. Why is the sky overhead seems to be blue? It is made up of atoms and molecules that are colorless.

Explanation / Answer

Answer(12):

Sky appears blue because molecules in the air scatter blue light from the sun more than they scatter red light.

Answer (13)

Light travels along the path which takes least time.

(Answer --- Option C)

Answer (6)

Option (d) -----Huygen's principle.

Answer (7) Option (c) ---- They travel at the same speed.

Reason: Both are electromagnetic radiation and travel with speed of light.

Answer (4) Frequency of green light = speed / wavelength

= (3×108 m/s) / (5.5 x 10-7 m)

= 5.45 × 1014 Hz (Answer)

Thanks!!!

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