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 |
(b) |
2.26×10 |

(c) |
1.16×10 |
(d) |
3.22×10 |

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 |
(b) |
2.26×10 |

(c) |
1.16×10 |
(d) |
3.22×10 |

1 Answer - 5876 Votes

3537

From lens equation

m=

Velocity of image w.r.t to lens is given by V_{I/L}m^{2}V _{O/L}

direction of velocity of images is same as that of object

V_{O/L}=5 m/s

V_{I/L}=(5)

=1.16×10^{−}^{3} m/s towards the lens