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lamda(1) and lamda(2) are used to illumi...

`lamda_(1)` and `lamda_(2)` are used to illuminated the slits. `beta_(1)` and `beta_(2)` are the corresponding fringe widths. The wavelength `lamda_(1)` can produce photoelectric effect when incident on a metal. But the wavelength `lamda_(2)` cannot produce photoelectric effect. The correct relation between `beta_(1)` and `beta_(2)` is

A

`beta_1ltbeta_2`

B

`beta_1=beta_2`

C

`beta_1gtbeta_2`

D

`beta_1gebeta_2`.

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