http://i.imgur.com/S4NcfXo.jpg An object is 8 cm to the left of a 4cm focal leng

Question

http://i.imgur.com/S4NcfXo.jpg An object is 8 cm to the left of a 4cm focal length converging lens. A second converging lens (also a 4cm focal length converging lens) is 8cm to the right of the first lens. Where is the image through the second lens? It is located exactly at the location of the second lens There is no image, light can't make it through 8cm to the right of the second lens Infinitely far away, the rays come out parallel. You are at rest. A converging lens has a focal length of 60cm and focuses light from the left towards the right. Then you accelerate it rightwards until it is going at speed 0.8c. Now it is going at speed 0.8c. What is the focal length now?

Explanation / Answer

lens1 (converging)

object distance = p1 = 8 cm

image distance = q1

f1 = 4 cm

1/8 + 1/q1 = 1/4

1/p + 1/39.6 = 1/10.3

p = 8 cm

for lens 2

objects distance p2 = 0

There is no image , light cant make it through

++++++++++++++++++

L = Lo*sqrt(1-(v/c)^2)

f = 60*sqrt(1-0.8^2)

f = 36 cm <<<<<_-------------answer

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