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 \(\theta \)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