20 FIGURE 9 20
Solution  Image formed by the first lens
1
1
1
1
1
1
v
u
f
−
=
1
1
1
1
30
10
v −
=
−
or
v1 = 15 cm
Rationalised 2023-24
Ray Optics and
Optical Instruments
239
FIGURE 9 21 A ray of light passing through
a triangular glass prism