When a thin convex lens is put in contact with a thin concave lens of the same focal length, the resultant combination has a focal length equal to
1Q97 When a thin convex lens is put in contact with a thin concave lens of the same focal length, the resultant combination has a focal length equal to
a) f/2
b) 2f
c) 0
d) none of these
Your Answer: (c)
Correct Answer: (d)
Score: -1
1focal length is defined as the distance of the point where a light ray paralell to the axis comes from infinity and meets to the pole
here the light ray will have no divergence or convergence as the thing behaves like a thin glass slab
further then the parallel light ray will meet at infinity so focal length =∞
