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A slit is located 'at infinity' in front...

A slit is located 'at infinity' in front of a lens of focal length 1 m and is illuminated normally with light of wavelength `6000Å`. The first minima on either side of the central maximum of the diffraction pattern observed in the focal plane of the lens are separated by 4 mm. What is the width of the slit?
[0.3 mm]

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PHYSICS GALAXY - ASHISH ARORA-WAVE OPTICS-Practice Exercise
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  5. In Young's experiment, the source is red light of wavelength 7xx10^(-7...

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  6. In Young’s double slit experiment, the upper slit is covered by a thin...

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  7. A coherent parallel beam of microwaves of wavelength lambda = 0.5 mm f...

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  8. A slit of width d is illuminated by white light (which consists of all...

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  9. Our disscusssion of the techniques for determining cosntructive and de...

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  11. A wedge-shaped film of air is produced by placing a fine wire of diame...

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  12. A thin soap film of thickness 3 xxx 10^(-7)m and mu = 1.5 is spreaded ...

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  13. A ray light of intensity I is incident on a parallel glass-slab at a p...

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  14. A point sources S emitting light of wavelength 600nm is placed at a ve...

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  15. A slit is located 'at infinity' in front of a lens of focal length 1 m...

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  16. From large distance microwaves fall on a long slit of width 5cm. If th...

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  17. A parallel beam of monochromatic light of wavelength 5900Å falls norma...

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  18. Three nicols prisms are placed such that, first and third are mutually...

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  19. Polarized light of intensity I(0) is incident on a pair of Polaroid sh...

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  20. A mixture of plane polarised and unpolarised light falls normally on a...

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