when an object placed (a) 20cm, (b) 4cm, in front of concave mirror of focal length 12cm. Find the nature and position of the image formed in each case.
Answers
Explanation:
(a) u = - 20 cm, f = -12 cm
1/v + 1/u = 1/f
1/v + 1/-20 = 1/-12
1/v = -1/12 + 1/20 = (-20 + 12)/240 = -8/240
V = - 30 cm
The image is formed at a distance of 30 cm in front of the mirror.
The image is real and inverted.
(b) u = - 4 cm, f = -12 cm
1/v + 1/u = 1/f
1/v + 1/-4 = 1/-12
1/v = -1/12 + 1/4 = (-1 + 3)12 = 2/12
V = 6 cm
The image is formed at a distance of 6 cm behind the mirror.
The image is virtual and erect.
Answer:
a) u = - 20 cm, f = -12 cm
1/v + 1/u = 1/f
1/v + 1/-20 = 1/-12
1/v = -1/12 + 1/20 = (-20 + 12)/240 = -8/240
V = - 30 cm
The image is formed at a distance of 30 cm in front of the mirror.
The image is real and inverted.
(b) u = - 4 cm, f = -12 cm
1/v + 1/u = 1/f
1/v + 1/-4 = 1/-12
1/v = -1/12 + 1/4 = (-1 + 3)12 = 2/12
V = 6 cm
The image is formed at a distance of 6 cm behind the mirror.
The image is virtual and erect.
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Explanation:
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