If several thin lenses of focal length f1, f2, f3, are in contact, the
effective focal length of their combination, is given by
1
2
3
1
1
1
1
f
f
f
f
=
+
+
+ …
The total power of a combination of several lenses is
P = P1 + P2 + P3 + …
7 Dispersion is the splitting of light into its constituent colour Rationalised 2023-24
Physics
248
POINTS TO PONDER
1