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Four light waves are represented by

1. $\text{y}=\text{a}_1\sin\omega\text{t}$
2. $\text{y}=\text{a}_2\sin(\omega\text{t}+\in)$
3. $\text{y}=\text{a}_1\sin2\omega\text{t}$
4. $\text{y}=\text{a}_2\sin2(\omega\text{t}+\in)$

Interference fringes may be observed due to superposition of:

• A
  $(i)$ and $(ii)$
• B
  $(i)$ and $(iii)$
• C
  $(ii)$ and $(iv)$
• ✓
  $(i), (ii), (iii)$ and $(iv)$