image is formed behind the mirror, then make sure the Likewise, the focal length
ID: 1789534 • Letter: I
Question
image is formed behind the mirror, then make sure the Likewise, the focal length can either be positive or negative depending on the mirror. A concave mirror takes parallel rays and focuses the mirror. The focal length for a converging mirror is positive. A convex mirror takes parallel rays and makes them diverge as if they are coming rrom a poine im vecx or tne mTror be called a diverging mirror. The focal length for a diverging mirror is negative A 5.10-cm tall pencil is placed 10.6 cm in front of a mirror. An image is formed 4.10 cm in front of the mirror. What is the focal length of the mirror? 2.96 cm image distance is negative. Conversely, if you are told the image distance is negat, Your Mac wll sleep soon uniess plugge nto a power outlet You are correct Your receipt no. is 157-673 Previous Thies Is the mirror converging or diverging? Incorrect Diverging Correct: Converging You are correct Your receipt no. is 157-2244 PreviousTries A 4.70-cm tall pencil is placed 12.4 cm in front of a mirror. An image is formed 4.10 cm behind the mirror. What is the focal length of the mirror? 3.08cm Double check either your algebra of the sign of image distance. Remember that the image is behind the mirror Submit Answer Incorrect. Tries 8/10 Previous Tries Is the mirror converging or diverging?Explanation / Answer
Given,
h = 4.7 cm ; o = 12.4 cm ; i = -4.1 cm
we know from lens equation that
1/f = 1/i + 1/o
f = o x i/(o + i)
f = 12.4 x -4.1/(12.4 - 4.1) = -6.13 cm
Hence, f = -6.13 cm
The focal length is negative so the mirror is converging.
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