27
(a)
m = ( fO/fe) = 28
(b)
m = f
f
f
e
O
O
1
+25

  = 33 6
Rationalised 2023-24
350
Physics
9 28
(a)
fO + fe = 145 cm
(b)
Angle subtended by the tower = (100/3000) = (1/30) rad Angle subtended by the image produced by the objective
=  
O
140
h
h
f
=
Equating  the two, h = 4