Why is the C-O-H bond angle in alcohols slightly less than the tetrahedral angle whereas the C-O-C bond angle in ether is slightly greater ?

In both alcohols and ethers , oxygen is sp^(3) - hybridised and has two lone pairs . However the R-O-H bond angle to alcohols is less than tetrahedral angle of 109^(@)28and the R-O-R bond angle to ethers is more than the tetrahedral angle of 109^(@)28 , Explain why ?

Bond angle in dimethyl ether is more than water.

The H-O-H angle in water molecule is about

C-O-C bond angle in ethers is higher than H-O-H bond angle in water through O is sp^3 -hybridisedin both the cases.

Bond angle in NH_4^+ is more than that in NH_3 .

Among the following metal carbonyls, the C-O bond order is lowest in

Lines a || b, c is the transversal angle y = ?