40)
We now find the angle subtended at the eye by the image when the
object is at u From the relations
 
h
v
m
h
u
′ =
=
we have the angle subtended by the image
 tan 
i
h
h
v
h
v
v u
u
θ
′
=
=
⋅
=
−
−
−
»q The angle subtended by the object, when it
is at u = –f θi
= fh


(9