Question

plzz answer it fast....n ray diagram is a must...plzz give the ray diagram...

Answer 1

Convex lens real image formation.

Distance of the object (candle) from the lens: u = -(50.0-26.0) cm.
    u = - 24.0 cm.

Distance of the image from the lens = v = +(74.0 - 50.0) cm
   v = 24.0 cm

Lens formula:    1/v - 1/u = 1/f
                          1/24 + 1/24 = 1/f
                          f = 12.0 cm

focal length = 12 cm.

ii)  new object distance = u = - (50.0 - 38.0) = - 12 cm.

      1/v - 1/u = 1/f
      1/v = 1/12 - 1/12 = 0
       v = infinity
   So the image is formed at infinity and so there is no image formed on the screen.

iii)  see the diagram enclosed.

Answer 2

the image formed in infinity