Physics
A boy uses monochromatic green light to find the refractive index. When a ray of monochromatic green light enters in a liquid medium from air medium as shown in the figure given below, the angle 1 is 45° and angle 2 is 30°.
(a) Determine the refractive index of the liquid.
(b) Represent in the diagram showing the path of the ray after it strikes the mirror and re-enters air. Mark in the diagram wherever necessary.
(c) Draw the diagram again, if plane mirror becomes normal to the refracted ray inside the liquid. Name the principle used.
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(a) Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism.
(b) When an empty test tube is placed in a beaker of water and viewed from above, its surface appears as a mirror. Explain.
If a light of a single colour is passed through a liquid having a piece of glass suspended in it, so on changing the temperature of the liquid, at a particular temperature, the glass piece is not seen.
(a) At what situation, the glass piece will not be seen?
(b) Why the light of a single colour is used?
(c) How can you define the term refractive index of a medium? State whether it can be less than 1 or not.