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

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?

Exercise 3

(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.

Exercise 4

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?