Calendar: 1882-1883 Page 660

APPLIED SCIENCES 657 Show how the bending of ray of light in passing from air into transparent solid is explained on the wave theory What meaning does the refractive index of the substance acquire on this theory Show how to find the position and magnitude of th image of an object placed at given distance from convex lens of given focal length An arrow inches long is placed inches in front of convex lens whose focal length is inches find the position and length of the image Describe the measurements which are required and the method of determining the refractive index of transparent prism An iron ball is made white hot and its spectrum examined by spectroscope What will be the nature of the spectrum seen Again piece of iron is used as one of the poles in the electric arc and the spectrum examined In what respects do the two spectra differ from one another 10 What is meant by Ci Interference of Light" Describe Newton's rings as seen by reflection and explain how they are produced What relations hold between the thickness of the air plate the diameters of the rings and the angle of incidence of the light 11 Distinguish between beam of ordinary light and beam of plane polarized light How would you employ rhomb of Iceland Spar to distinguish between them FIRST YEAR cubic metre of wood floats in water with fths of its volume immersed find the pressure on the bottom and on one of its sides Calculate also the depth to which it would sink in liquid of specific gravity Describe the cistern barom3ter the Magdeburg hemispheres and illustrate by an example in each case the methods of finding the pressure of the atmosphere per square centimetre with these instruments τ τ