Statement-1 : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of .Statement-2 : The centre of the interference pattern in Newton's rings is dark.
- AStatement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.
- BStatement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.
- CStatement-1 is false, Statement-2 is true.
- DStatement-1 is true, Statement-2 is false.
Solution & Step-by-step Explanation
Newton's rings are formed by the interference between light reflected from the bottom surface of the lens and the top surface of the glass plate. At the point of contact, the air film thickness is zero. However, light reflected from the glass plate (denser medium) undergoes a phase shift of . Thus, the two waves interfere destructively, making the center dark. Statement 1 explains Statement 2.