Question

Power of a lens whose focal length is + 1.0m​

Answer 1

Answer:

Yes! Here is your answer!

Explanation:

Beam after refraction from convex lens forms an image at its focus, that is, at a distance of  1m from the convex lens.

Thus this image is at a distance of 1m−0.75m=0.25m from the concave lens behind the lens. Thus the image is formed on its focus by the convex lens. Thus after refraction from the concave lens, it becomes parallel to the principal axis.