A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (i), refraction (r) and emergence (Le) as shown. Which angle or angles has he NOT marked correctly?

To determine focal length of a concave mirror a student obtains the image of a well lit Distant object on a screen. To determine the focal length of the given concave mirror he needs to measure the distance between:

To determine the focal length of a convex lens by obtaining a sharp image of a distant object we generally follow the following steps which are not in proper sequence.

(A) Hold the lens between the object and the screen

(B) Measure the distance between the lens and the screen

(C) Select a well lit distant object

(D) Place a screen opposite to the object on the lab table

(E) Adjust the position of the lens to form a sharp image

The correct sequence of these steps is:

After viewing different slides, a student draws following diagrams. Select the one which depicts binary fission in amoeba.

After observing the prepared slides of binary fission in amoeba and budding in following observations were reported:

(A) Single cells of amoeba and yeast were undergoing binary fission and budding respectively

(B) Cytokinesis was observed in the yeast cell.

(C) Elongated nucleus was dividing to form two daughter nuclei in amoeba.

(D) A chain of buds was observed due to reproduction in amoeba.

The correct observation(s) is/are: