Last Updated On 16-03-2023 - By Jeesha Sara
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 :-
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
Next Question :
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A body of mass 1 kg falls freely from lens of 100 m on a platform of mass 3 kg which is mounted on a spring having spring constant K=1.25×106 N/m. The body sticks to the platform and the spring’s maximum compression is found to be x. Given that g=10ms−2, the value of x will be close to |
|||
|
(a) |
4 cm |
(b) |
8 cm |
|
(c) |
80 cm |
(d) |
40 cm |
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