NEET Physics - New - Wave Optics

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Question - 1

Consider sunlight incident on a slit of width \({ 10 }^{ 4 }\)A. The image seen through the slit shall darkness as observed through the polaroid

  • A Be a fine sharp slit white in colour at the centre
  • B A bright slit white at the centre diffusing to zero intensities at the edges 
  • C A bright slit white at the centre diffusing to regions of different colours
  • D only be a diffused slit white in colour

Question - 2

In a young's double slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case

  • A There shall be alternate interference pattern of red and blue
  • B There shall be alternate interference pattern of red distinct from that for  blue
  • C There shall be no interference fringes
  • D There shall be alternate interference pattern of red mixing with one for  blue

Question - 3

Consider the sunlight incident on a pinhole of width.\({ 10 }^{ 3 }A\) The image of a pinhole seen on a screen shall be

  • A A sharp white ring
  • B Different from geometrical image
  • C A diffused central spot, white in colour 
  • D diffused coloured region around a sharp central white spot

Question - 4

Consider the diffraction pattern for a small pinhole. As the size of the hole is increased

  • A The size decrease
  • B The intensity increase
  • C The size increase
  • D The intensity decrease

Question - 5

For light diverging from a point source

  • A The wavefront is spherical
  • B The intensity decrease in proportion to the distance squared
  • C The wavefront is parabolic
  • D The intensity at the wavefront does not depend on the distance

Question - 6

A source of light lies on the angle bisector of two plane mirror included at angle . The value of \(\theta \) so that the light reflected from one mirror does not reach the other mirror does not reach each other mirror will be 

  • A \(\theta \ge 120°\)
  • B \(\theta \ge 90°\)
  • C \(\theta \ge 90°\)
  • D None of the above

Question - 7

The ratio of the speed of an object to the speed of its real image of magnification m in the case of a convex mirror is

  • A \(-\frac { 1 }{ { m }^{ 2 } } \)
  • B \({ m }^{ 2 }\)
  • C -xm
  • D \(\frac { 1 }{ { m } } \)

Question - 8

In a concave mirror, an object is placed at a distance \({ d }_{ 1 }\) from the focus and the real image is formed at a distance \({ d }_{ 2 }\) from the focus. then the focal length of the nirror is:

  • A \(\sqrt { { d }_{ 1 }{ d }_{ 2 } } \)
  • B \({ d }_{ 1 }{ d }_{ 2 }\)
  • C \({ { (d }_{ 1 }{ /d }_{ 2 }) }^{ /2 }\)
  • D \(\sqrt { { d }_{ 1 }{ /d }_{ 2 } } \)

Question - 9

Which is not true for the image formed in a plane mirror? The image is 

  • A virtual
  • B erect
  • C laterally inverted
  • D closer to the mirror than the object

Question - 10

The relation between focal length \(f\) and radius of curvature \(R\) of a spherical mirror is

  • A \(f=R\)
  • B \(f=R/2\)
  • C \(f=2 R\)
  • D none of these
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