| Assertion (A): For best contrast between maxima and minima in the interference pattern of Young's double slit experiment, the amplitudes of light waves emerging from the two sources should be equal. |
| Reason (R): For interference, the sources must be coherent. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: B
Solution :
| Option [b] is correct. |
| Exploitation: For destructive interference, |
| \[a={{a}_{1}}\tilde{\ }{{a}_{2}}\] When \[{{a}_{1}}={{a}_{2}}\] only the minima will be completely dark. This will create the best contrast. So the assertion is true. |
| For interference, the sources must be coherent. Reason is also true. But the reason does not explain the assertion. |
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