43. A convex lens of focal length 100 cm and a concave lens of focal length 10 cm are placed coaxially at a separation of 90 cm. If a parallel beam of light is incident on convex lens, then after passing through the two lenses the beam
(1)Converges (2) Diverges
(3) Remains parallel (4) Disappears.
Correct answer is option (3). The parallel beam of light first hits the convex lens. Then, the light converges. The converging beam of light hits the concave lens. Then, the beam of light gets parallel.