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A point object is located at a distance ...

A point object is located at a distance of 100cm from a screen. A lens of focal length 23 cm mounted on a movable frictionless stad is kept between the source and the screen. The stand is attached to a spring of natureal length 50cm and spring constant `800N//m` as shown in Figure . Mass of the stand with lens is 2 kg. How much impulse P should be imparted to the stand so that a real image of the object is formed on the screen after a fixed time gap? Also find this time gap. (Neglect width width of the stand)

A

`(pi)/(10)sec`

B

`(pi)/(20)sec`

C

`(pi)/(30)sec`

D

`(pi)/(40)sec`

Text Solution

Verified by Experts

The correct Answer is:
D
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