Question

What does “ real image” mean how can you obtain a “ real image” ? Explain.

Answer 1

Real image means when the image can be placed on a screen,that means light rays after reflection or refraction meets at a point which exists in reality.

But for virtual image,this point is found by backward extension of reflected or refracted light rays,so the point doesn't exist in reality.

For a convex lens,putting the object at any place,except at distance equals or less than focal length you get real image,similarly in case of concave mirror excepting for the object placed at a distance equals to focal length or less than that you get real image.

Below is an example of real image formed by convex lens,and one real image formed by concave mirror.

And,below is an example of virtual image formed by concave mirror and plane mirror,