Look at the ray diagram shown ,what will be th focal length of th e`1^(st)`and the `2^(nd)`lens,if the incident light ray passes without any deviation?

From the ray diagram shown in Fig. calculte the focal length of concave lens. .

From the ray diagram shown below, calculate the focal length of the other convex lens.

Name the part of a lens through which a ray of light passes without suffering any deviation.

The part of the lens through which the ray of light passes without suffering deviation is called _________.

When a ray of light strikes the ________ lens obliquely at the optical centre, it follows without any deviation.

In which case does a light ray pass through the centre of a thin lens without deviation?

What will be the angel of deviation of a ray of light incident normally on any smaller side of a total reflecting prism?

A convex lens is used to focus the rays from the far off light bulb at a distance of one meter from the lens. What should be the focal length of the lens ? Draw a ray diagram to show the formation of image.

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?