Parallel waves in a ripple tank are diffracted as they pass through a gap in a barrier.
Three changes that can be made to this arrangement are listed.
1 Decrease the wavelength of the waves.
2 Increase the amplitude of the waves.
3 Decrease the size of the gap.
Which changes will cause the shape of the diffracted waves to be less curved?
(A) 1, 2 and 3
(B) 1 and 3 only
(C) 1 only
(D) 2 and 3 only