Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the Sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the:

If you are asked to select a group of two vegetables, out of the following, having homologous structures which one would you select?

To determine the approximate value of the focal length of a given concave mirror, you

focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always:

In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence (Li) and in each case measure the- values of the corresponding angle of refraction (Lr) . and angle of emergence (Le). Other basis of your observations your correct conclusion is:

In the following ray diagram the correctly marked angles are: