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Wave Optics

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 47% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path difference between the two lights reaching at a point on the screen is 7 /4. The ratio of intensity of fringe at this point with respect to the maximum intensity of the fringe is :

  1. 12
  2. 34
  3. 13
  4. 14

Answer

(1) 12

Solution

Phase difference: = 2 x= 2 7 4= 7 2

Identical sources: I=I 2 2

II = 2 7 4

= 2 (2 - 4 )= 2 4= 12

Answer: (1)

Keep practising — Wave Optics

Ques. 2JEE Main 2024, 29 January (Evening Shift)

In a single slit diffraction pattern, a light of wavelength 6000 A is used. The distance between the first and third minima in the diffraction pattern is found to be 3 mm when the screen is placed 50 cm away from slits. The width of the slit is 10-4 m.

Ques. 3JEE Main 2024, 27 January (Evening Shift)

When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of :

  1. 90
  2. 30
  3. 45
  4. 60
Ques. 4JEE Main 2024, 27 January (Evening Shift)

A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by convex lens on screen, placed on its focal plane. The first minima will be formed for the angle of diffraction of (degree).

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