Question

a convex lens of focal length 30cm and ca concave lens of focal length 30cm are oalced in contact. what is the value of power of combined lens​

Answer 1

Answer:

given

focal length of convex lens=30cm

now power=

$100 \div 30 = 3.33$

and

now focal length of concave lens=-30cm

now power=-3.33

now total power of combination=0

Answer 2

Answer:

0 Dioptre

Explanation:

3.33-3.33=0