A) increases
B) decreases
C) becomes infinite
D) remains the same
Correct Answer: B
Solution :
When apparatus is in air, \[{{\beta }_{air}}=\frac{D\lambda }{d}\]When apparatus is immersed in water, the wavelength of light decreases to\[\frac{\lambda }{\mu }\] Therefore, \[{{\beta }_{water}}=\frac{D\lambda }{\mu d}\]ie,\[\beta \]decreases as\[\lambda \]decreases.
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