Home
Class 12
PHYSICS
A: Particle theory fails to explain the ...

A: Particle theory fails to explain the velocity of light in air and water.
R: According to particle theory, light in a dense medium is moving faster than in rare medium.

A

Both assertion and reason are true and the reason is correct explanation of the assertion.

B

Both assertion and reason are true but reason is not correct explanation of the assertion.

C

Assertion is true but the reason is false.

D

Both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • WAVE OPTICS

    KUMAR PRAKASHAN|Exercise SECTION-C NCERT Exemplar Solution (Long Answer Type Questions)|5 Videos

  • SEMICONDUCTOR ELECTRONICS : MATERIALS, DEVICES AND SIMPLE CIRCUITS

    KUMAR PRAKASHAN|Exercise Section-D : Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exams)|129 Videos

Similar Questions

Explore conceptually related problems

According to particle theory of light what is the velocity of light in a dense medium, compared to that in rare medium ?

What phenomena of light can be explained on the basis of particle theory of light?

The speed of light in water is less than the speed of light in air, confirms the assumption of which theory of light?

Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

Velocity of light in rarer medium is v_(1) it passes through denser medium with velocity v_(2) incidents at 'i' angle and refracts by 'r angle, then .....

The optical properties of a medium are governed by the relative permitivity (epsi_(r)) and relative permeability (mu_(r)) . The refractive index is defined as sqrt(mu_(r)epsi_(r))=n . For ordinary material epsi_(r)gt0 and mu_(r)gt0 and the positive sign is taken for the square root. In 1964, a Russian scientist V. Veselago postulated the existence of material with epsi_(r)lt0andmu_(r)lt0 . Since then such 'metamaterials' have been produced in the laboratories and their optical properties studied. For such materials n=-sqrt(mu_(r)epsi_(r)) . As light enters a medium of such refractive index the phases travel away from the direction of propagation. (i) According to the description above show that if rays of light enter such a medium from air (refractive index = 1) at an angle theta in 2^(nd) quadrant, then the refracted beam is in the 3^(rd) quadrant. (ii) Prove that Snell's law holds for such a medium.

The lens governing the behavior of the rays namely rectilinear propagation laws of reflection and refraction can be summarised in one fundamental law known as Fermat's principle. According to this principle a ray of light travels from one point to another such that the time taken is at a stationary value (maximum or minimum). if c is the velocity of light in a vacuum the velocity in a medium of refractive index mu is (c)/(mu) hence time taken to travel a distance l is (mul)/(c) if the light passes through a number of media, the total time taken is ((1)/(c))summul or (1)/(c)intmudl if refractive index varies continuously. Now summul is the total path, so that fermat's principle states that the path of a ray is such that the optical path in at a stationary value. this principle is obviously in agreement with the fact that the ray are straight lines i a homogenous isotropic medium. it is found that it also agrees with the classical laws of reflection and refraction. Q. If refractive index of a slab varies as mu=1+x^(2) where x is measured from one end then optical path length of a slab of thickness 1 m is

The lens governing the behavior of the rays namely rectilinear propagation laws of reflection and refraction can be summarised in one fundamental law known as Fermat's principle. According to this principle a ray of light travels from one point to another such that the time taken is at a stationary value (maximum or minimum). if c is the velocity of light in a vacuum the velocity in a medium of refractive index mu is (c)/(mu) hence time taken to travel a distance l is (mul)/(c) if the light passes through a number of media, the total time taken is ((1)/(c))summul or (1)/(c)intmudl if refractive index varies continuously. Now summul is the total path, so that fermat's principle states that the path of a ray is such that the optical path in at a stationary value. this principle is obviously in agreement with the fact that the ray are straight lines i a homogenous isotropic medium. it is found that it also agrees with the classical laws of reflection and refraction. Q. The optical path length followed by ray from point A to B given that laws of refraction are obeyed as shown in figure.

KUMAR PRAKASHAN-WAVE OPTICS-SECTION-D (MULTIPLCE CHOICE QUESTIONS (MCQS)) (MCQS FROM DARPAN BASED ON TEXTBOOK)
  1. In an interference the intensity of two interfering waves are I and 4I...

    Text Solution

    |

  2. In a single slit diffraction with lambda = 500 nm and a lens of diamet...

    Text Solution

    |

  3. A: Particle theory fails to explain the velocity of light in air and w...

    Text Solution

    |

  4. A: It is not possible to have an interference between sound waves prod...

    Text Solution

    |

  5. A: The obstacle must be in the order of 10^(-7)m to see the differatio...

    Text Solution

    |

  6. A: To increase resolving power of a telescope, the diameter of objecti...

    Text Solution

    |

  7. What changes during the polarisation of light?

    Text Solution

    |

  8. If light of intensity lo is incident at an angle 45^(@) with optical a...

    Text Solution

    |

  9. What should be wavelength of light to get 5^(th) bright fringe at a po...

    Text Solution

    |

  10. The polarisation of light proved that light is composed of ......

    Text Solution

    |

  11. The limit of resolution of an optical instrument arises an account of ...

    Text Solution

    |

  12. Ray of light moving in water incidents on glass plate. Reflected light...

    Text Solution

    |

  13. The diameter of telescope lens is 0.61 m, the A wavelength of light is...

    Text Solution

    |

  14. In Young's experiment distance between twe slits is 0.28 mm and distan...

    Text Solution

    |

  15. Which of the following can not be polarised?

    Text Solution

    |

  16. 100pi phase difference = ...... path difference.

    Text Solution

    |

  17. What will be angle of first order maxima obtained by Fraunhoffer diffr...

    Text Solution

    |

  18. The width of fringes ...... as the Young's double slit experiment move...

    Text Solution

    |

  19. What is the angle between the plane of polarisation and the direction ...

    Text Solution

    |

  20. In Young's double slit experiment, the intensity at a point P on the s...

    Text Solution

    |