KVPY Government Jobs Exams

A narrow parallel beam of light falls on a glass sphere of radius R and refractive index μ at normal incidence.
The distance of the image from the outer edge is given by

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KVPY Other Question

Three equal charges +q are placed at the three vertices of an equilateral triangle centered at the origin. They
are held in equilibrium by a restoring force of magnitude F(r) = kr directed towards the origin, where k is a
constant. What is the distance of the three charges from the origin ? A particle of mass m undergoes oscillations about x = 0 in a potential given by V(x) =
2
1 kx2 – V0cos 




a
x ,
where V0, k, a are constants. If the amplitude of oscillation is much smaller than a, the time period is given
by-