Q8 of 27 Page 132

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)

Siddhu knows that the double convex lens acts as a convergent lens but there are some exceptions when double convex lens does not behave like a converging lens. So he may ask the following questions:

• What will happen when the refractive index of the surrounding medium is greater than the refractive index of lens?


• When the object is placed between pole & focal point, then will the lens behave like a convergent lens?


• How does the lens behave when kept in water?


More from this chapter

All 27 →
6

How do you verify experimentally that the focal length of a convex lens is increased when it is kept in water? (AS1)

 7

How do you find the focal length of a lens experimentally? (AS1)

 9

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.

 10

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)