Part A What is the focal length of a second lens that will produce a well-focuse
ID: 2301578 • Letter: P
Question
Part A
What is the focal length of a second lens that will produce a well-focused, 2.0-cm -tall image on the screen?
Express your answer to two significant figures and include the appropriate units.
f2 =
Part B
What is the distance from the screen of the second lens?
Express your answer to two significant figures and include the appropriate units.
f2 =
Part B
What is the distance from the screen of the second lens?
Express your answer to two significant figures and include the appropriate units.
d =Explanation / Answer
so first find image of divergine lens
1/20 + 1/q = 1/-20
q=-10 cm
this is like object for next lens and it will be 120 cm from screen so we know p + q = 120 cm
and we know M total = M1 M2 = (10/20)*(-q/p) = -2
q/p = 4 so q = 4p, thus 5p = 120
so p = 24 cm and thus q = 96 cm
so 1/f = 1/24 + 1/96
f= 19.2 cm
b) we already found this, q = 96 cm