Question

6.
6.
The lenses of power +3.50, +2.5D and
+1D are placed in contact with each
other in an optical device. The effective
power of combination of these lenses
is :
3.5 test
A) 5D
B) 6D
C) 7D
D) 8D​

Answer 1

Answer:

Answer:7d will be the combination of lens