A student used a device (X) to obtain / focus the image of a well illuminated distant building on a screen (S) as shown in the diagram. Select the correct statement about the device (X).

   

Select from the following the best experimental setup for tracing the path of a ray of light passing through a rectangular glass slab.

Four students measured focal length of a concave mirror while performing an experiment as shown.

The picture which depicts the correct image formation is:

While tracing the path of a ray of light passing through glass slab as shown in the diagram, four students interpreted the results as given below:

(A) $\angle r>\angle e=\angle i$
(B) $\angle r=\angle e<\angle i$
(C) $\angle i=\angle r>\angle e$
(D) $\angle i=\angle e>\angle r$

The student who has made the correct interpretation is