In a young's double slit experiment,two ...

In a young's double slit experiment,two slits are illuminated with a light of wavelength `800nm`.The line joining `A_(1)P` is perpendicular to `A_(1)A_(2)` as shown in the figure.If the first minimum is detected at `P`,the value of slits separation '`a`' will be

The distance of screen from slits `D=5cm`

`0.4mm`

`0.2mm`

`0.5mm`

`0.1mm`

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