Important Questions of Wave Optics Physics | Zigya

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181.

Assertion:  A beam of charged particles is employed in the treatment of cancer. 

Reason: Charged particles on passing through a material medium lose their energy by causing ionization of the atoms along their path.

  • if both assertion and reason are true and the reason is the correct explanation of the assertion

  • if both assertion and reason are true and the reason is not the correct explanation of the assertion

  • if assertion is true but reason is false

  • if both assertion and reason are false statements


182.

Assertion: Coloured spectrum is seen when we look through a muslin cloth. 

Reason:  It is due to the diffraction of white light on passing through fine slits

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

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

  • If the assertion is true but the reason is false.

  • If both assertion and reason are false.


183.

Assertion:  When tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of the shadow of the obstacle. 

Reason: Destructive interference occurs at the centre of the shadow.

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

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

  • If the assertion is true but the reason is false

  • If both assertion and reason are false.


184.

Assertion:  S.I. units are logical and coherent. 

Reason: S.l. system of units is a rationalised system.

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

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

  • If the assertion is true but the reason is false.

  • If both assertion and reason are false.


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185.

Two coherent monochromatic light beams of amplitude 3 and 5 units are superposed. The maximum and minimum possible intensities in the resulting beams are in the ratio

  • 4 : 2

  • 16 : 1

  • 8 : 2

  • 4 : 2


186.

Assertion:  Skiers uses air glasses. 

Reason:  Light reflected by snow is partially polarised.

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

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

  • If assertion is true but reason is false.

  • If assertion is false but reason is true.


187.

The distance between two coherent sources is 1 mm. The screen is placed at a distance of 1 m from the sources. If the distance of the third bright fringe is 1.2 mm from the central fringe, the wavelength of light used is

  • 4000 Å

  • 5000 Å

  • 6000 Å

  • 7200 Å


188.

Two polaroids are crossed. If now one of them is rotated through 30° and unpolarized light of intensity IO is incident on the first polaroid, then the intensity of transmitted light will be

  • Io/4

  • 3Io/4

  • 3Io/8

  • Io/8


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189.

A wavefront is represented by the plane y = 3-x. The propagation of the wave takes place at

  • 45° with x direction

  • 135° with x direction

  • 60° with x direction

  • No sufficient data


190.

The intensity ratio of two coherent sources of light is P. They are interfering in the same region and produce an interference pattern. Then the fringe visibility is

  • 1+P2P

  • 2P1+P

  • P1+P

  • 2P1+P


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