1.

When a monochromatic light passes through a slit 0.2 mm wide and falls on a screen 3.5 m away, the first minimum of the diffraction pattern is 9.1 mm from the centre of the central maximum. The wavelength of the light is

Answer»

`2600 Å`
`4000 Å`
`4300 Å`
`5200 Å`

Solution :Since `x_(m)ltltD," for the MTH MINIMUM, "sin theta_(m) cong tan theta_(m)=(x_(m))/(L)=(m lamda)/(a).`


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