YDSE One Slit Closed – Rankers Physics

Young's Double Slit Experiment: Practice Problem & Solution

Assertion (A): In Young's double slit experiment, if one of the slits is closed, intensity at the position of central fringe becomes half. Reason (R): Resultant intensity, being sum of intensities from individual slits, becomes half as one slit is closed.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Young's Double Slit Experiment. Understanding the underlying formula is key to arriving at the correct answer below:

If intensity from one slit is (I_0), the central maximum with two slits is (4I_0). If one slit is closed, the intensity at the center becomes (I_0), which is one-fourth, not half. Reason (R) is also incorrect as intensities don't simply add algebraically. Both A and R are false.

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. A beam of light of $lambda = 600 nm$ from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is: (2014)
2. Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 metre from eye. The wavelength of light is $5000 \AA$: (2002)
3. Assertion (A): In case of Young double slit experiment width of all fringes were equal. Reason (R): Angular width of fringes were equal.  
4. Assertion (A): The fringe pattern in Young's double slit experiment is result of both phenomena of interference and diffraction. Reason (R): Diffraction results from superposition of wavelets of same wavefront.  
5. Assertion (A): Diffraction is a sure indication of wave nature. Reason (R): Only transverse waves can be diffracted.