Unit: Optics
Year: 1994 Question#: 87
Question: Some Brass Knuckles are located beyond the center of curvature, C, of a concave spherical mirror having principal focus F, as shown in the diagram below.
Where is the brass knuckle's image located?
(1 ) beyond C
(2 ) between C and F
(3 ) between F and the mirror
(4 ) behind the mirror
What is this question really asking?
Explanation by: Smar T.
[ Return to question menu ]
Answer 1
beyond C
INCORRECT
You know what the Physics Phool says... WHEN IN DOUBT, DRAW A RAY DIAGRAM!!! as you can see from Smar T.'s ray diagram (see answer 2 below), the image is located between C and F! Yeah!!! : ) >
return to top
Answer 2
between C and F
CORRECT
as seen in the ray diagram above, the Brass Knuckles are located between C and F!
: ) : ) : ) : ) : ) return to top
Answer 3
between F and the mirror
INCORRECT
How many times do I have to freakin' say it !? (see explanation for (2)) return to top
Answer 4
behind the mirror
INCORRECT
return to top
What's this question really asking?
This question is asking if you can put pen to paper. Now who can't? Just as the Physics Phool says...DRAW THE RAY DIAGRAM return to top
