Draw a ray diagram for calculating the focal length and nature of a spherical mirror which forms a 1/3
times magnified virtual image of an object placed 18 cm in front of it.
Answers
Answered by
3
Explanation:
Since the image formed is magnified and virtual, the mirror is convex.
According to the convention
u = - 18 cm
m = 1/3 = − v/u
v = 6 cm
By using lens mirror formula:
1/v + 1/u = 1/f
f = uv / u + v
f = -18 x 6 / - 18 + 6
f = - 108 / - 12
f = 9 cm
Thus the focal length of the mirror is 9 cm.
Answered by
1
Answer:
The focal length of the mirror is 9 cm.
Explanation:
Since, the image formed is magnified and virtual, the mirror is convex.
According to the conversation
u = - 18 cm
m = 1/3 = - v/u
v = 6 cm
By using lens mirror formula:
1/v + 1/u = 1/f
f = uv/ u + v
f = - 18 x 6/-18 + 6
f = - 108 / - 12
f = 9
Thus the focal length of the mirror is 9 cm.
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