2) Jill cannot see objects clearly that are closer to the eye than 80.0 cm. What is the focal length of the contact farsighted A +36.4 cm lenses that will enable her to see objects at a distance of 25.0 cm from her eyes? B) -36.4 cm J- d C) -21.2 cm f 5 1 new N D) +32.5 cm E) +21.2 cm + Jill, near point : d - 80 25 N 7 Jill in farsighted virt. near near p+ pt (neg) I manat at s = 25.0 m3) The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. If the microscope is focused on a small object, what is the distance between the object and the objective lens? ? 0 r , Q _' ,2 0 (M; r | ,o IA" " . t A) 0.4 cm ('0 CM B) 0.7 cm 1 \\_'_/__'J 6) Consider two diffraction gratings; one has 4000 lines per cm and the other one has 6000 lines per cm. Make a statement comparing the dispersion (spread of the diffraction pattern) of the two gratings. A) Both gratings produce the same dispersion, but the orders are sharper for the 4000-line grating. B) The 4000-line grating produces the greater dispersion. N @The 6000-line grating produces the greater dispersion. D) Both gratings produce the same dispersion, but the orders are sharper for the 6000~line grating. I \\