A plane wave front \[(\lambda =6\times {{10}^{-7}}m)\] falls on a slit – McqOptions

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1.	A plane wave front \[(\lambda =6\times {{10}^{-7}}m)\] falls on a slit 0.4 mm wide. A convex lens of focal length 0.8 m placed behind the slit focusses the light on a screen. What is the linear diameter of second maximum?
A.	6 mm
B.	12 mm
C.	3 mm
D.	9 mm
Answer» B. 12 mm

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