Exercise 1

A Galilean telescope adjusted for a relaxed eye is 36.1cm long. If the objective lens has a focal length of 39.0 cm , what is the magnification? Follow the sign conventions. (answer in 2 significant figures)

Exercise 2

What is the focal length of a magnifying glass of 2.8 magnification for a relaxed normal eye? Follow the sign conventions. (answer in two significant figures and units)

Exercise 3

A person's right eye can see objects clearly only if they are between 27cm and 82 cm away.(answer in 2 significant figures and units)

1-What power of contact lens is required so that objects far away are sharp?

2-What will be the near point with the lens in place?

Exercise 4 (answer in two significant figures and units)

1-The overall magnification of an astronomical telescope is desired to be24. If an objective of 88-cm focal length is used, what must be the focal length of the eyepiece?

2-What is the overall length of the telescope when adjusted for use by the relaxed eye?

Exercise 5 (answer in two significant figures and units)

A magnifying glass with a focal length of 9.2cm is used to read print placed at a distance of 7.4 cm .

1-Calculate the position of the image. Follow the sign conventions.

2-Calculate the angular magnification.

Exercise 6

A microscope uses an eyepiece with a focal length of1.70 cm.Using a normal eye with a final image at infinity, the barrel length is17.5 cmand the focal length of the objective lens is0.80 cm.What is the magnification of the microscope? (answer in 2 significant figures)

Exercise 7

A television camera lens has a 16-cm focal length and a lens diameter of 5.8 cm .What is itsf-number? (answer in 2 significant figures)

Exercise 8

A magnifying glass is rated at 3.5 for a normal eye that is relaxed.

1-What would be the magnification of this lens for a relaxed eye whose near point is 60cm ?

2-What would be the magnification of this lens for a relaxed eye whose near point is 16cm?

Exercise 9

A magnifier is rated at 2.5 for a normal eye focusing on an image at the near point.(answer in 2 significant figures)

1-What is its focal length?

2-What is its focal length if the 2.5 refers to a relaxed eye?

Exercise 10 (answer in two significant figures and units)

1-For a camera equipped with a 49-mm-focal-length lens, what is the object distance if the image height equals the object height?

2-How far is the object from the image on the film?