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# Four light sources produce the following four waves :(i) $y_1= a \sin(\omega t+\phi _1)$ (ii) $y_2= a \sin 2 \omega t$ (iii) $y_3= a' \sin(\omega t+\phi _2)$ (iv) $y_4= a' \sin(3 \omega t+\phi)$ Superposition of which two waves give rise to interference ?

(1) (i) and (ii)

(2) (ii) and (iii)

(3) (i) and (iii)

(4) (iii) and (iv)

(3)