Chromatic aberration in lenses can be corrected by using a combination of 

For a convex lens to form a real image, the distance between the object and the screen will be:

The inside portion of a hollow metal sphere of diameter 20 cm is polished. The portion will therefore form a 

The phenomenon used for explaining the formation of a rainbow in the sky is 

(a) State the condition for light ray incident on a concave mirror to reflect through the principal focus of the mirror.

(b) Explain spherical aberration as a defect of curved mirrors

(c) The diagram above illustrates an image formed when an object is placed in front of a particular lens. Redraw the diagram and indicate the center of curvature, C, principal focus, F, and the principal axis. ( SEE THE DIAGRAM ABOVE)

(d) What is meant by accommodation in connection to the human?

(e) State quantitatively, the (i) values of the near and far point of a normal eye. (ii) Use the answer in 10c(i) to determine the change in optical power of the normal human eye when reading a book and viewing the sky.[lens-to-retina distance = 2.5 cm].