PART I: PHYSICS
SECTION 1 (Maximum Marks: 18)
• This section contains SIX (06) questions.
• The answer to each question is a SINGLE DIGIT INTEGER ranging from 0 TO 9, BOTH INCLUSIVE
• For each question, enter the correct integer corresponding to the answer using the mouse and the onscreen virtual numeric keypad in the place designated to enter the answer.
• Answer to each question will be evaluated according to the following marking scheme:
Full Marks : +3 If ONLY the correct integer is entered;
Zero Marks : 0 If the question is unanswered;
Negative Marks : -1 In all other cases.
A large square container with thin transparent vertical walls and filled with water 
is kept on a horizontal table. A student holds a thin straight wire vertically inside the water 12cm from one of its corners, as shown schematically in the figure. Looking at the wire from this corner, another student sees two images of the wire, located symmetrically on each side of the line of sight as shown. The separation (in cm) between these images is________.
Text Solution
Verified by Experts3
(3)
The above solution is assumed according to the normal incidence. It we consider the actual angle of incidence, i.e., 
the answer comes to be 12 .
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