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nehal helal Grade:
        sir a convex lens is resting upon a block attached to a vibrating spring if the amplitude of block is a .if an object is placed on the principal axis of lens at a distance 3f from the mean position of block then please find the distance between the extreme ends of image?
7 years ago

Answers : (1)

vikas askiitian expert
510 Points

dear nehal i am giving u hint for this but solve by yourself ,

wrt to lens , there are two positions of object which are extream positions of this motion of particle ...

let these points are P,Q then

P = 3f+a , Q = 3f-a

now , inage corresponding to P & Q is P1 , Q1

apply lens formula for both images & find P1& Q1  then

 (P1-Q1)  = distance bw two extream ends

ans is {2f2a/4f2-a2}

7 years ago
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