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3496 Mon 5:09 PM Q E 03 Safari File Edit View History Bookmarks Develop Window Help O O O HW11. ponses /submit?dep 9175099#Q3 Reade gn.ne Apple Disney ESPN Yahoo! Telescope Can Be Used As A Ca... SunGard Higher Education Certain Type Of Film Requires A... Homework Help Ask A Questio... HW11. 3. -1 points SerCP9 25.P.007.soln. My Notes A certain type of film requires an exposure time of 0.010 s with an f 14 ens setting. Another type of film requires quadruple the light energy to produce the same level of exposure. What f number does the second type of film need with the 0.010-s exposure time? (Note: your answer should be a whole number. f/ Need Help? Read t Chat About It it Answer Save Progress Practice Another Version 4. -2 points SerCP9 25. P.009 My Notes The near point of a person's eye is 60.2 cm. To see objects clearly at a distance of 23.0 cm, what should be the focal length and power of the appropriate corrective lens? (Neglect the distance from the lens to the eye.) a) foca ength of the appropriate corrective lens Cm (b) power of the appropriate cor ective lens diopters Need Help? Read it Chat About It My Notes 5. -4 points SerCP9 25.P.012.W

Explanation / Answer

1.

Formula for f-number and intensity is

(f2-number)2/(f1-number)2=I1/I2

=>(f2-number)2=(f1-number)2*(I1/I2)=(1/4)*(10)2

f2-number=5

so we should use f/5.0 setting on camera

2)

a)

1/f =1/u-1/v=-1/23-(-1/60.2)

f=-37.22 cm

b)

so power

P=1/f =1/0.3722 =2.69 Diaopters

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