1.What is the refractive index of a medium when light is incident upon it at 45o to the normal and the angle of the refraction is 30o from the normal?


2.Which type of lens would be a good choice to use for the purposes of magnification?


3.The nature of an image produced by a lens is defined by which attributes?


4.What does r represent in the above equation?


5. What does i represent in the above equation?


6.Which formula correctly states how refractive index is related to the angles of incidence and refraction?


7. What is the distance from the lens to the principal focus called?


8. Consider a convex lens – parallel rays of light are brought to a focus at which point?


9. How does a lens work?


10. What is refraction?


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