Question:

Anna holds a 11 D magnifier directly in front of her eye to get a close look at a 19-mm -diameter penny. Assume a typical 25 cm

Anna holds a 11 D magnifier directly in front of her eye to get a close look at a
19-mm -diameter penny. Assume a typical 25 cm near point and a distance of 1.7 cm
between the lens and the retina.
Part A:
What is the closest possible distance that she can hold the coin to have it appear in
focus?
Express your answer with the appropriate units.
Answer: 6.7 cm
Part B:
At this distance, how large does the image of the coin appear on her retina?
Express your answer with the appropriate units.

Anna holds a 11 D magnifier directly in front of her eye to get a close look at a 19-mm -diameter penny. Assume a typical 25 cm near point and a distance of 1.7 cm between the lens and the retina. Part A: What is the closest possible distance that she can hold the coin to have it appear in focus? Express your answer with the appropriate units. Answer: 6.7 cm Part B: At this distance, how large does the image of the coin appear on her retina? Express your answer with the appropriate units.

Answer

- So.
so
+ ।
.
formula used,
So
Si
f
(given)
D = 11ml
f = %
f = 1/1ml = f = 100 cm =)
ta
If = 7.14 om
(given)
Sitx = 25 1 Si=25-X = Si = 25-1,7
Si= 23.3 cm
image distance is on the left 'Thus it is conventionally
negative
Si = -23.3 con,
.
4= ?
)
JO
t
Si
f
- -
= Si-f
=
)
So = f Si
So
f Si
Si-f
So
(7014) ( 23.3) Con
-23.3 - 7,14).
5.44 cm.
A
\ 9.
S.

- So. so + । . formula used, So Si f (given) D = 11ml f = % f = 1/1ml = f = 100 cm =) ta If = 7.14 om (given) Sitx = 25 1 Si=25-X = Si = 25-1,7 Si= 23.3 cm image distance is on the left 'Thus it is conventionally negative Si = -23.3 con, . 4= ? ) JO t Si f - - = Si-f = ) So = f Si So f Si Si-f So (7014) ( 23.3) Con -23.3 - 7,14). 5.44 cm. A \ 9. S.

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