State one feature by which the phenomenon of interference can be distinguished from that of diffraction.
A parallel beam of light of wavelength 600 nm is incident normally on a slit of width ‘a’. If the distance between the slit and the screen is 0.8 m and the distance of 2nd order maximum from the centre of the screen is 15 mm, calculate the width of the slit.
A parallel beam of light of wavelength 600 nm is incident normally on a slit of width ‘a’. If the distance between the slit and the screen is 0.8 m and the distance of 2nd order maximum from the centre of the screen is 15 mm, calculate the width of the slit.
CBSE OUTSIDE DELHI - SET 1 2008
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The given features:-
$\text{ (Numerical : Formula}\text{ y} =\frac{(2\text{n} + 1)\lambda\text{D}}{2\text{a}}\text{ or } \frac{5\lambda\text{D}}{2\text{a}}$
Substitution and Result: $8 × 10^{-5}\ m$ or $0.08\ mm.$
| Interference | Diffraction |
|
Fringes of unequal width |
|
Fringes of decreasing intensity |
|
Due to superposition of secondary wavefronts. |
|
Minima at $\theta = \frac{\lambda}{\text{a}}$ |
Substitution and Result: $8 × 10^{-5}\ m$ or $0.08\ mm.$
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