In the figure below, a pinecone is at distance p1 = 2.4 m in front of a lens of
ID: 2065494 • Letter: I
Question
In the figure below, a pinecone is at distance p1 = 2.4 m in front of a lens of focal length f = 0.48 m. A flat mirror is at distance d = 1.9 m behind the lens. Light from the pinecone passes rightward through the lens, reflects from the mirror, passes leftward through the lens, and forms a final image of the pinecone.(a) What is the distance between the lens and the final image?
m
(b) What is the overall lateral magnification of the pinecone?
(c) Describe the final image. (Select all that apply.)
real
virtual
upright
inverted
to the left of the lens
to the right of the lens
Explanation / Answer
1/p+/1/q=1/f------------1 for lens find image i.e q1 =.6 (+ve ,right to the lens) qi become(p2) vertual object to mirror,and is at distance 1.9-.6=1.3m left to the mirror... final image q2 is at 1.3 m right to the mirror... these rays again reflected back to lens i'e image formed by mirror become object to lens from 1 p2=1.9+1.3=3.2(-ve ,object right to lens) f=.48 q2=+.41 image right to lens so a).41m b)m=-(.41/2.4)=-.170 c)real invert (m is -ve) right to lens