Is it obvious that the centre of mass should be in the object?

An object is placed in between the optical centre and focus of a thin convex lens. What is the nature of image of the object?

Consider a two-particle system with the particle having masses m_(1) and m_(2) . If the first particle is pushed towards the centre of mass through a distance d, by what distance should be second particle be moved so as to keep the centre of mass at the same position?

At what position should an object be placed in front of a spherical mirror such that the size of the image is equal to that of the object?

Give the location of the centre of mass of a solid cylinder having uniform mass density.

There is a point object at the centre of a glass sphere of diameter 12 cm and refractive index 1.5 . Calculate the distance (in cm) of the image from the surface of the sphere.