- #1
Raghav Gupta
- 1,011
- 76
I understand this that when an object is kept at focus of convex lens, then image is formed at infinity.
So when we keep a convex lens above plain mirror and move object needle on the principal axis of convex lens and see a coinciding image with needle on lens and measure distance from lens then it is focal length of convex lens. As the Rays have retraced their path by being normal to plain mirror.
Now, when we pour some drops of water on plain mirror and again keep on top The convex lens, how in this case when the object and image coincides, on measuring the distance from convex lens this is the focal length of the system?
For some images see the link
http://www.seminarsonly.com/Enginee...ctive-Indices-of-Water-And-Turpentine-Oil.php
So when we keep a convex lens above plain mirror and move object needle on the principal axis of convex lens and see a coinciding image with needle on lens and measure distance from lens then it is focal length of convex lens. As the Rays have retraced their path by being normal to plain mirror.
Now, when we pour some drops of water on plain mirror and again keep on top The convex lens, how in this case when the object and image coincides, on measuring the distance from convex lens this is the focal length of the system?
For some images see the link
http://www.seminarsonly.com/Enginee...ctive-Indices-of-Water-And-Turpentine-Oil.php