SSC JE Mechanical Engineering 27th Jan 2018 Shift-2
Instructions
For the following questions answer them individually
Question 86
Which of the following statement(s) is/are CORRECT for critical angle?
I. Refractive angle is $$90^{o}$$.
II. Light ray goes from rarer to denser medium.
III. Light ray goes from denser to rarer medium.
Question 87
To hear a distinct echo, the time interval between the original sound and reflected
sound must be atleast ______.
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