The unit of power of lens is called ___________ .

 What is the SI unit of power?

A. Newton

B. Watt

C. Newton-Second

D. Joule

A compound microscope consists of two converging lenses. Lens 1,called the objective, is a distance 61.0 mm from lens 2, called theeyepiece. The objective is placed in between the object and theeyepiece. The objective has a focal length of 15.0 mm, and theeyepiece has a focal length of 25.5 mm. If the microscope is usedto examine an object placed 24.1 mm in front of theobjective,
a) What is the distance of the final image with respect to theeyepiece?
b) Is the image real or virtual?
c) Is the image inverted or non-inverted?
d) What is the overall magnification of the microscope?

A myopic person has a near point of 18 centimeters and a far point of 56 centimeters. What power lens should be prescribed?