IIT-JEE Exam

A bi-convex lens is formedwith two thin plano-convex lenses..Refractive index n of the first
lens is 1.5 and that of the second lens is 1.2. Both the curved surfaces are of the same radius of curvature R =
14 cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be

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IIT-JEE Other Question
Athin uniform rod, pivoted at O, is rotating in the horizontal plane with constant angular speed w,At time, t = 0, a small insect starts from O and moves with constant speed v with respect to the rod
towards the other end. It reaches the end of the rod at t = T and stops. The angular speed of the system remains
throughout. Themagnitude of the torque (| 
|) on the systemaboutO, as a function of time is best represented
by which plot ? A small massm is attached to amassless string whose other end is fixed at P as shown in the figure. Themass
is undergoing circular motion is the x-y plane with centre at O and constant angular speed . If the angular
momentum of the system, calculated about O and P are denoted by O L

and P L

respectively, then