| (1) A slit S is necessary if we use an ordinary extended source of light. |
| (2) A slit S is not needed if we use an ordinary but well collimated beam of light. |
| (3) A slit S is not needed if we use a spatially coherent source of light. |
A) (1), (2) and (3)
B) (1) and (2)
C) (2) and (3)
D) (1) and (3)
Correct Answer: D
Solution :
In the case of Young's double slit experiment. A slit 5 is necessary if we use an ordinary extended source of light and A slit S is not needed if we use a spatially coherent source of light.
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