Question

a student uses two concave lens of power 2D each. what will the net power of their combination.​

Answer 1

Explanation:

f=

P

1

P

1

=+2D⟹f

1

=0.5m=50cm

since f is positive, it is convex lens.

P

2

=−4D⟹f

2

=−0.25m=−25cm

since f is negative, it is concave lens.

Answer 2

Answer:

A student uses two concave lens of power 2D each . 2D will the net power of their combination