(i) यदि वायु, जल तथा काँच को हम क्रमशः a,w तथा g से प्रदर्शित करें तो प्रश्नानुसार,
`""_(a)mu_(w)=4//3,""_(a)mu_(g)=3//2`
`:. " " ""_(a)mu_(w)xx""_(w)mu_(g)=""_(a)mu_(g)`
`:. " " ""_(w)mu_(g)=(""_(a)mu_(g))/(""_(a)mu_(w))=(3//2)/(4//3)=(9)/(8)`
(ii) `" " ""_(g)mu_(w)=(1)/(""_(w)mu_(g))=(1)/(9//8)=(8)/(9)`
