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1)An instrument for measuring focal length of a lens is called : 

2)The distance through which the screw advances when it is rotated through one division of the head scale is called?

3)The pitch of a spherometer is 1 mm and number of head scale division is 100. What is the least count of the spherometer?

4)What is the zero correction for a spherometer? 

5)When the circular scale completes one rotation, what is the distance moved by the screw?

6)The principle of spherometer is same as which of the following?

7)What is the possible least count of your laboratory spherometer?

8)The least count of spherometer is calculated by:

9)What is the instrument used to measure the radius of curvature of a surface? 

10)Why is a spherometer so called?