(a)
A security mirror used in a big showroom has radius of curvature o
m. If a customer is standing at a distance of 20 m from the cash
counter, find the position, nature and size of the image formed in the
security mirror.
Answers
Answer:
PHYSICS
An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by the two mirrors. What is the radius of curvature of the convex mirror?
November 22, 2019avatar
Zameer Sravi
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ANSWER
as the distance between object and plane mirror is 30cm i.e, distance between plane mirror and convex mirror is 20cm so the image distance
for convex mirror is 10cm
for convex mirror , u=−50 ; v=+10
let f be focal length
v
1
+
u
1
=
f
1
10
1
−
50
1
=
f
1
f=
4
50
radius=f×2
radius=25cm , hence option A is correct
The position of the image is 2.22 cm.
Nature of the image is real
Size of the image is diminished.
Explanation:
Given that,
Radius of curvature = 5 m
Object distance = 20 m
We need to calculate the image distance
Using formula of mirror
Where, v = image distance
u = object distance
f = focal length
Put the value into the formula
Hence, The position of the image is 2.22 cm.
Nature of the image is real
Size of the image is diminished
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Topic : optics
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