Calculating Star Image Distance in a Concave Mirror | Radius of Curvature 1.70 m

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To calculate the image distance of a star reflected by a concave mirror with a radius of curvature of 1.70 m, the object distance is set at infinity due to the star's vast distance. The light from the star is treated as a parallel beam, which focuses at the focal point of the mirror. The focal length of the concave mirror is half the radius of curvature, resulting in a focal length of 0.85 m. Consequently, the image of the star is formed at the focal point, 0.85 m from the mirror's surface. Understanding these principles is essential for accurately determining image distances in optics.
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The light from a star reflects from a concave mirror with a radius of curvature of 1.70 m. Determine how far the image of the star is from the surface of the mirror.

I also don't know how to do this one either :cry:
 
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-_-" Since the star is really really far away, set the distance of the object from the mirror to be at infinity. Then, draw the diagram. The last time I did these sort of diagrams is when I was 17, so I can't really help you much with the diagram...
 
so how exactly do I have to do this T.T...
 
Light from the star can be taken as a paralllel beam of light. When a parallel beam of light falls on a concave mirror or a convex lens they are brought to focus at the focal length. In the cas of concave mirror focal length = half the radius of curvature.
 

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