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Study the figure and answer the following questions


a.  What type of telescope is shown in the figure?

b.  Label the main parts of the telescope.

c.  Which type of mirror does the telescope use?

d.  What other type of telescope uses a curved mirror?

e.  Explain the working of the above telescope.

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a. Newtonian telescope is shown in the given figure.

b.
 

c. Both plane and spherical mirror is used in this telescope. The spherical mirror is a concave mirror.

d. Cassegrain telescope also uses a curved mirror.

e. Light rays coming from a heavenly body (distant object) get reflected by the concave mirror. Before the reflected rays converge at the focus of the concave mirror, it is again reflected by the plane mirror as shown. As a result, the rays pass through the eyepiece and we get a magnified image of the body.

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