*** 41. A Galilean telescope is formed by intercepting the converging light from the primarylens before it forms a real image and diverging it to produce plane waves (so that the imagelooks like it came from infinitely far away). Light from far away is focused by a +4 D primarylens and a diverging lens of power -20 D is placed 20 cm from the primary, as shown in thediagram below.P = +4 DP2 = -20 D20 cma) 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 ofsome object divided by the angular size of the same object seen with the naked eye. Findthe magnifying power of the Galilean telescope above by choosing an object with a smallangular size when seen with the naked eye and calculating its angular size in the finalimage of the telescope.

Detailed solution is given below:

Answered: a) Work through the two-lens…

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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?