Question

Four light waves are represented by
$\left(i\right)y=a_1\sin \omega t$ $\left(ii\right)y=a_2\sin (\omega t+\epsilon )$
$\left(iii\right)y=a_1\sin 2\omega t$ $\left(iv\right)y=a_2\sin 2(\omega t+\epsilon )$
Interference fringes may be observed due to superposition of

• A. $\left(i\right)$ and $\left(ii\right)$
• B. $\left(i\right)$ and $\left(iii\right)$
• C. $\left(ii\right)$ and $\left(iv\right)$
• D. $\left(iii\right)$ and $\left(iv\right)$

Answer 1

Answer: (A), (D)

$\left(i\right)$ and $\left(ii\right)$
$\left(iii\right)$ and $\left(iv\right)$

For superposition, frequency of waves should be same
therefore superposition of (i) with (ii) and (iii) with (iv) will happen