Q10 of 27 Page 132

A convex lens is made up of three different materials as shown in the figure Q-10. How many of images does it form? (AS2)

As the lens is made up of three different materials, their respective refractive index would also differ. Let the refractive index of three materials be u1, u2, u3 respectively. If parallel beams of light are incident in the lens then due to the difference in refractive index, all the three materials would converge the light at different foci thus creating three images of the same object at different foci .


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Harsha tells Siddhu that the double convex lens behave like a convergent lens. But Siddhu knows that Harsha assertion is wrong and corrected Harsha by asking some questions. What are the questions asked by Siddhu? (AS2)

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Assertion (A): A person standing on the land appears taller than his actual height to a fish inside a pond. (AS2)

Reason (R): Light bends away from the normal as it enters air from water.


Which of the following is correct? Explain.


a) Both A and R are true and R is the correct explanation of A.


b) Both A and R are true and R is not the correct explanation of A.


c) A is true but R is false.


d) Both A and R are false.


e) A is false but R is true.

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Can a virtual image be photographed by a camera? (AS2)

 12

You have a lens suggest an experiment to find out the focal length of the lens. (AS3)