A monochromatic beam of light falls on YDSE apparatus at some angle (say\[\theta \]) as shown figure. A thin sheet of glass is inserted in front of the lower slit\[{{s}_{2}}\]. The central bright fringe (path difference = 0) will be obtained

• A. At O
• B. Above O
• C. Below O
• D. Anywhere depending on angle\[\theta \], thickness of plate t, and refractive index of glass\[\mu \]