The radius of curvature of a secondary mirror

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Reference no: EM1312392

A Cassegrain astronomical telescope uses two mirrors to form the image. The larger (concave) objective mirror has a focal length f1 = +51.5 cm. A small convex secondary mirror is mounted d = 43.5 cm in front of the primary. As shown in the figure, light is reflected from the secondary through a hole in the center of the primary, thereby forming a real image 8.00 cm behind the primary mirror. Find the radius of curvature of the secondary mirror?

A. In order to completely melt a material,

Heat must be added to bring the material to the melting temperature & then the latent heat of fusion must be added to change the phase.
Heat must be added to make the object exp& to the melting volume
No heat needs to be added.
Stir while adding heat.

B. An aluminum rod 15 cm in length is heated from 10 degrees Celsius to 50 degrees Celcius. Find the change in length?

15 cm
8 cm
6 cm
None of the above.

C. Compute is Kepler’s first law of planetary orbits?

The planets move on ellipses with the Sun at the center of the ellipse.
The planets revolve around the Earth.
The position of the planets foretells the future.
The planets move on ellipses with the Sun at one of the foci.

Reference no: EM1312392

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