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a) Work through the two-lens combination to find the location of the final image. b) Is the final image erect or inverted?

a) Work through the two-lens combination to find the location of the final image. b) Is the final image erect or inverted?

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*** 41. A Galilean telescope is formed by intercepting the converging light from the primary lens before it forms a real image and diverging it to produce plane waves (so that the image looks like it came from infinitely far away). Light from far away is focused by a +4 D primary lens and a diverging lens of power -20 D is placed 20 cm from the primary, as shown in the diagram below. P = +4 D P2 = -20 D 20 cm a) Work through the two-lens combination to find the location of the final image. b) Is the final image erect or inverted?
Transcribed Image Text:*** 41. A Galilean telescope is formed by intercepting the converging light from the primary lens before it forms a real image and diverging it to produce plane waves (so that the image looks like it came from infinitely far away). Light from far away is focused by a +4 D primary lens and a diverging lens of power -20 D is placed 20 cm from the primary, as shown in the diagram below. P = +4 D P2 = -20 D 20 cm a) Work through the two-lens combination to find the location of the final image. b) Is the final image erect or inverted?
c) The magnifying power of a telescope is defined as the angular size of the image of some object divided by the angular size of the same object seen with the naked eye. Find the magnifying power of the Galilean telescope above by choosing an object with a small angular size when seen with the naked eye and calculating its angular size in the final image of the telescope.
Transcribed Image Text:c) The magnifying power of a telescope is defined as the angular size of the image of some object divided by the angular size of the same object seen with the naked eye. Find the magnifying power of the Galilean telescope above by choosing an object with a small angular size when seen with the naked eye and calculating its angular size in the final image of the telescope.
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