Question

If power of a lens is 2 diopter, ot of other is 4 diopter, what is focal length of
a)
combination of lenses:
20cm
b) 50cm
c) -50cm
d) 100cm​

Answer 1

Answer:

d) 100 cm it may be helpful for you

Answer 2

Answer:

b= 50cm

Explanation:

P=P1+P2

-4+2=-2

P=1/f

=1÷2

=0.5m×100=50cm