The wedge is given an acceleration to the left. ∴ The block has a pseudo acceleration to the right, pressing against the wedge because of which the block is not moving. ∴mg‌sin‌θ=ma‌cos‌θ or a=
g‌sin‌θ
cos‌θ
Total reaction of the wedge on the block isN=mg‌cos‌θ+ma‌sin‌θ or N=mg‌cos‌θ+