Question

If in YDSE set up screen is shifted towards plane of slit by 0.3 metre then fringe width changes by 0.4 mm. Determine wavelength 'λ' . of light.

(1) \(\frac{10^{-3}}3\) mm

(2) \(\frac73\times10^{-3}\) mm

(3) \(\frac43\times10^{-3}\) mm

(4) \(\frac53\times10^{-3}\) mm

Answer 1

Correct option is (3) \(\frac43\times10^{-3}\) mm