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Assertion : Just before setting, the sun...

Assertion `:` Just before setting, the sun may appear to be elliptical. This happens due to refraction.
Reason `:` Refraction of light ray through the atmosphere may cause different magnification in mutually perpendicular directions.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion

B

If both assertion and reason are true but reason is not the correct explanation of the assertion

C

If assertion is true but reason is false

D

If the assertion and reason both are false

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The correct Answer is:
a
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Negative Refractive Index: One of the most fundamental phenomena in optics is refraction. When a beam of light crosses the interface between two different materials, its path is altered depending on the difference in the refractive indices of the materials. The greater the difference, the greater the refraction of the beam. For all known naturally occurring materials the refractive index assumes only positive values. But does this have to be the case? In 1967, Soviet physicist Victor Veselago hypothesized that a material with a negative refractive index could exist without violating any of the laws of physics. Veselago predicted that this remarkable material would exhibit a wide variety of new optical phenomena. However, until recently no one had found such a material and Veselago's ideas had remained untested. Recently, meta-material samples are being tested for negative refractive index. But the experiments show significant losses and this could be an intrinsic property of negative index materials. Snell's law is satisfied for the material having a negative refractive index, but the direction of the refracted light ray is 'mirror-imaged about the normal to the surface. There will be an interesting difference in image formation if a vessel is filled with "negative water" having refractive index - 1.33 instead of regular water having refractive index 1.33. Say, there is a fish in a vessel filled with negative water. The position of the fish is such that the observer cannot see it due to normal refraction since the refracted ray does not reach to his eye. But due to negative refraction, he will be able to see it since the refracted ray now reaches his eye. A ray in incident on normal glass and. "Inegative glass" at an angle 60^@ . If the magnitude of angle of refraction in normal glass is 45^@ then, what will be the magnitude of angle of refraction in the "negative glass"?

Negative Refractive Index: One of the most fundamental phenomena in optics is refraction. When a beam of light crosses the interface between two different materials, its path is altered depending on the difference in the refractive indices of the materials. The greater the difference, the greater the refraction of the beam. For all known naturally occurring materials the refractive index assumes only positive values. But does this have to be the case? In 1967, Soviet physicist Victor Veselago hypothesized that a material with a negative refractive index could exist without violating any of the laws of physics. Veselago predicted that this remarkable material would exhibit a wide variety of new optical phenomena. However, until recently no one had found such a material and Veselago's ideas had remained untested. Recently, meta-material samples are being tested for negative refractive index. But the experiments show significant losses and this could be an intrinsic property of negative index materials. Snell's law is satisfied for the material having a negative refractive index, but the direction of the refracted light ray is 'mirror-imaged about the normal to the surface. There will be an interesting difference in image formation if a vessel is filled with "negative water" having refractive index - 1.33 instead of regular water having refractive index 1.33. Say, there is a fish in a vessel filled with negative water. The position of the fish is such that the observer cannot see it due to normal refraction since the refracted ray does not reach to his eye. But due to negative refraction, he will be able to see it since the refracted ray now reaches his eye. When the angle of incidence will be equal to angle of refraction for material having negative refraction index?

ERRORLESS -RAY OPTICS-SET
  1. Assertion : Just before setting, the sun may appear to be elliptical. ...

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  2. In an astronomical telescope in normal adjustment a straight black lin...

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  3. Three lenses L(1) , L(2) , L(3) are placed co-axially as shown in figu...

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  4. An object is placed at a point distant x from the focus of a convex le...

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  5. The diameter of the eye-ball of a normal eye is about 2.5 cm . The pow...

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  6. In a thin spherical fish bowl of radius 10 cm filled with water of ref...

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  7. A small fish 0.4 m below the surface of a lake is viewed through a sim...

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  8. A water drop in air refractes the light ray as

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  9. Which of the following ray diagram show physically possible refraction...

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  10. Following figure shows the multiple reflections of a light ray along a...

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  11. When the rectangular metal tank is filled to the top with an unknown l...

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  12. A concave mirror and a converging lens (glass with mu = 1.5) both have...

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  13. A ray of light strikes a plane mirror M at an angle of 45^(@) as shown...

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  14. A slab of glass, of thickness 6 cm and refractive index 1.5, is placed...

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  15. A point source of light S is placed at the bottom of a vessel containi...

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  16. A point object is placed midway between two plane mirrors a distance a...

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  17. A convergent beam of light is incident on a convex mirror so as to con...

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  18. PQR is a right angled prism with other angles as 60^(@) and 30^(@). Re...

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  19. When a ray is refracted from one medium to another, the wavelength cha...

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  20. Two this lenses, when in contact, produce a combination of power +10 d...

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  21. The plane faces of two identical plano convex lenses, each with focal ...

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