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A narrow slit of width 0.3 mm is illuminated normally by a parallel beam of light of wavelength 6×10-7 m. The Fraunhofer diffraction pattern is obtained on a screen placed in the focal plane of a convex lens of focal length 25 cm. The lens is placed quite close to the slit. Find the width of central maximum on the screen.

Important Questions on Diffraction of Light

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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 7
A parallel light beam of wavelength 6000 Å passes through a slit 0.2 mm wide and forms a diffraction pattern on a screen 1.0 m away from the slit. Find the width of the central maximum on the screen. What would be the width of this maximum, if the apparatus be immersed in water of refractive index 43?
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 1
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygens' wavelet from the edge of the slit and the wavelet from the mid-point of the slit is:
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 2
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is:
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 3
A beam of light of λ=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:
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 4
For a parallel beam of monochromatic light of wavelength λ, diffraction is produced by a single slit whose width e is of the wavelength of light. If D is the distance of the screen from the slit, the width of the central maxima will be:
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 5
In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of single-slit pattern?
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 6
A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of light of wavelength 5×10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is:
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ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 7
In a diffraction pattern due to a single slit of width e, the first minimum is observed at an angle 30° when light of wavelength 5000 Ao is incident on the slit. The first secondary is observed at an angle of: