Ray Optics and ...

The object and the image are at distance of $$9\  cm$$ and $$16\  cm$$ respectively from the focal length of an equiconvex lens of radius of curvature $$12 \ cm$$. The refractive index of the material of the lens is:

The refractive indices of glass and quartz w.r.t. air are 3/2 and 12/5 respectively. The refractive index of quartz w.r.t. glass is:

When a ray of light is refracted, the refracted ray does not have the same wavelength as the incident ray. Which of the following explain this phenomenon? 
I. Some of the energy of the incident ray is carried away by the reflected ray 
II. The boundary surface absorbs some of the energy of the incident ray 
III. The incident and refracted rays do not travel with the same velocity

The lateral shift in rectangular glass slab depends on which of the following properties of a medium ?

A persons image appears on the far side of an optical instrument, upside down. What is the optical instrument? 

The main reason for axial chromatic aberration in the formation of images by a lens is/are:

For which of the two lenses $$L_1$$ and $$L_2$$ the chromatic aberration will be more if the power of $$L_1$$ is less than that of $$L_2$$:

A magnifying glass is what kind of lens, and where do where should I place the lens relative to the object to see an image larger than the object and right-side-up? (f stands for the focal length of the lens.)

Refraction of light occurs when:

In chromatic aberration of a convex lens, :