An object is at a distance of 20m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be :
(a)
0.92×10−3 m/s away from the lens
(b)
2.26×10−3 m/s away from the lens
(c)
1.16×10−3 m/s towards the lens
(d)
3.22×10−3 m/s towards the lens
An object is at a distance of 20m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be :
(a)
0.92×10−3 m/s away from the lens
(b)
2.26×10−3 m/s away from the lens
(c)
1.16×10−3 m/s towards the lens
(d)
3.22×10−3 m/s towards the lens
Question ID - 50315 | SaraNextGen Top Answer
An object is at a distance of 20m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be :
(a)
0.92×10−3 m/s away from the lens
(b)
2.26×10−3 m/s away from the lens
(c)
1.16×10−3 m/s towards the lens
(d)
3.22×10−3 m/s towards the lens
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An object is at a distance of 20m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be : |
|||
|
(a) |
0.92×10−3 m/s away from the lens |
(b) |
2.26×10−3 m/s away from the lens |
|
(c) |
1.16×10−3 m/s towards the lens |
(d) |
3.22×10−3 m/s towards the lens |
From lens equation
m=
Velocity of image w.r.t to lens is given by VI/Lm2V O/L
direction of velocity of images is same as that of object
VO/L=5 m/s
VI/L=
(5)
=1.16×10−3 m/s towards the lens