PLEASE HELP ME!!!FOUR students A,B,C,D followed the procedure to find the focal length of concave mirror...?
FOUR students A,B,C followed the procedure to find the focal length of concave mirror...
A: kept the lens and the screen on a horizontal stand to get a clear sharp object
B: kept the lens in stand and held the screen in hand for a sharp image
C: kept the lens in hand and moved it to get a sharp focus
who is correct??
options
a) A
b) B
c) C
d) all are correct
PLEASE HELP ME!!!FOUR students A,B,C,D followed the procedure to find the focal length of concave mirror...?
is the question about a mirror or a lens??
Reply:i think C is the ans. but in case A, do the students movethe lens? if they move, then A is the answer
Reply:ans: c
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