ona hot summer night the refractive index of air is

Ona hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam:

A. bends downwards

B. bends upwards

C. becomes narrower

D. goes horizontally without any deflection

Answer : bends upwards

Solution :
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Releted Question 1

In Young’s double-slit experiment, the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width is

A. unchanged.

B. halved

C. doubled

D. quadrupled

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Releted Question 2

Two coherent monochromatic light beams of intensities $$I$$ and $$4\,I$$ are superposed. The maximum and minimum possible intensities in the resulting beam are

A. $$5\,I$$ and $$I$$

B. $$5\,I$$ and $$3\,I$$

C. $$9\,I$$ and $$I$$

D. $$9\,I$$ and $$3\,I$$

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Releted Question 3

A beam of light of wave length $$600\,nm$$ from a distance source falls on a single slit $$1mm$$ wide and a resulting diffraction pattern is observed on a screen $$2\,m$$ away. The distance between the first dark fringes on either side of central bright fringe is

A. $$1.2\,cm$$

B. $$1.2\,mm$$

C. $$2.4\,cm$$

D. $$2.4\,mm$$

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Releted Question 4

Consider Fraunh offer diffraction pattern obtained with a single slit illuminated at normal incidence. At the angular position of the first diffraction minimum the phase difference (in radians) between the wavelets from the opposite edges of the slit is

A. $$\frac{\pi }{4}$$

B. $$\frac{\pi }{2}$$

C. $$2\,\pi $$

D. $$\pi $$

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Ona hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam:

Releted MCQ Question on
Optics and Wave >> Wave Optics

In Young’s double-slit experiment, the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width is

Two coherent monochromatic light beams of intensities $$I$$ and $$4\,I$$ are superposed. The maximum and minimum possible intensities in the resulting beam are

A beam of light of wave length $$600\,nm$$ from a distance source falls on a single slit $$1mm$$ wide and a resulting diffraction pattern is observed on a screen $$2\,m$$ away. The distance between the first dark fringes on either side of central bright fringe is

Consider Fraunh offer diffraction pattern obtained with a single slit illuminated at normal incidence. At the angular position of the first diffraction minimum the phase difference (in radians) between the wavelets from the opposite edges of the slit is

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Ona hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam:

Releted MCQ Question on Optics and Wave >> Wave Optics

In Young’s double-slit experiment, the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width is

Two coherent monochromatic light beams of intensities $$I$$ and $$4\,I$$ are superposed. The maximum and minimum possible intensities in the resulting beam are

A beam of light of wave length $$600\,nm$$ from a distance source falls on a single slit $$1mm$$ wide and a resulting diffraction pattern is observed on a screen $$2\,m$$ away. The distance between the first dark fringes on either side of central bright fringe is

Consider Fraunh offer diffraction pattern obtained with a single slit illuminated at normal incidence. At the angular position of the first diffraction minimum the phase difference (in radians) between the wavelets from the opposite edges of the slit is

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