Answer:
Linear width of central maximum, \[{{\beta }_{0}}=\frac{2D\lambda }{d}\] Angular width of central maximum\[=\frac{{{\beta }_{0}}}{D}=\frac{2\lambda }{d}\] (i) When slit width d decreases, angular width increases, (ii) When distance D between the slit and screen is increased, angular width does not change. (iii) When light of smaller wavelength \[\lambda \]is used, angular width decreases.
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