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Wave Optics

JEE Main 2025 (Online) 24th January Evening ShiftMCQEasy📈 Topic in 50% papers+4−1
Ques. 1JEE Main 2025, 24 January (Evening Shift)

Young's double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm. The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm. The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m, will be:

  1. 0.63 mm
  2. 0.33 mm
  3. 0.46 mm
  4. 0.23 mm

Answer

(4) 0.23 mm

Solution

In the liquid, '= and = 'Dd.

[figure]

= 690 10-9 0.721.44 1.5 10-3

=2.3 10-4 m=0.23 mm

Answer: (4)

Keep practising — Wave Optics

Ques. 2JEE Main 2025, 23 January (Evening Shift)

The width of one of the two slits in Young's double slit experiment is d while that of the other slit is x d. If the ratio of the maximum to the minimum intensity in the interference pattern on the screen is 9:4 then what is the value of x ? (Assume that the field strength varies according to the slit width.)

  1. 2
  2. 3
  3. 4
  4. 5
Ques. 3JEE Main 2025, 22 January (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is false but (R) is true
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
  3. Both (A) and (R) are true and (R) is the correct explanation of (A)
  4. (A) is true but (R) is false
Ques. 4JEE Main 2025, 22 January (Evening Shift)

A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm . [Assume that the light is incident nearly perpendicular to the glass surface.]

  1. 68.7 nm
  2. 137.5 nm
  3. 94.8 nm
  4. 275 nm
Ques. 5JEE Main 2025, 22 January (Evening Shift)

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

  1. (A) is true but (R) is false
  2. Both (A) and (R) are true and (R) is the correct explanation of (A)
  3. (A) is false but (R) is true
  4. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

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