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प्रश्न
When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?
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उत्तर
When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. This is because light waves are diffracted from the edge of the circular obstacle, which interferes constructively at the centre of the shadow. This constructive interference produces a bright spot.
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संबंधित प्रश्न
Two sources are called coherent if they produce waves ______________ .
Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio ______.
Two sources of light are coherent if they have ______.
Two source S1 and S2 of intensity I1 and I2 are placed in front of a screen [Figure (a)]. The pattern of intensity distribution seen in the central portion is given by Figure (b).
 (a) |
 (b) |
- S1 and S2 have the same intensities.
- S1 and S2 have a constant phase difference.
- S1 and S2 have the same phase.
- S1 and S2 have the same wavelength.
What is interference?
Which sources are called coherent sources?
Which sources are called incoherent sources?
What occurs when two waves meet in the same phase?
What occurs when two waves meet in opposite phase?
For two waves of equal intensity \[I_0\], which expression gives the resultant intensity?
What path difference produces constructive interference?
What is the phase difference for constructive interference?
What path difference produces destructive interference?
How do the waves behave at points of destructive interference?
What is observed when two incoherent sources superpose?
