The image below shows the position of two mirrors inside a reflector-style telescope. Light from far-off objects enters the body of the telescope through the opening on the right. That light is reflected off a spherical mirror in the back of the telescope and then again off a flat mirror that redirects the light to a screen where the image of the object appears in focus. Given that the image of the eagle on the screen is in focus, and the actual eagle is 726m away from the spherical mirror, what is the radius of curvature of the spherical mirror?

The image below shows the position of two mirrors inside a reflector-style telescope. Light from far-off objects enters the body of the telescope through the opening on the right. That light is reflected off a spherical mirror in the back of the telescope and then again off a flat mirror that redirects the light to a screen where the image of the object appears in focus. Given that the image of the eagle on the screen is in focus, and the actual eagle is 726m away from the spherical mirror, what is the radius of curvature of the spherical mirror?

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