Question

Study the figure and answer the following question

(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

Answer 1

Hint:In the question we are given a telescope and we are asked several question about it generally there are four types of telescopes Newtonian telescope ,Cassegrain telescope,refractor telescope and reflector telescope out of which some contains spherical mirror as given in the question hence we have use the knowledge of telescope to answer the questions.

Complete answer:
(a) Newtonian telescope is shown in the given figure A Newtonian telescope was invented by the English scientist Sir Isaac Newton. And it has both primary and secondary mirrors

(b) This the labeled diagram of the newtonian telescope

(c) In the Newtonian telescope a light ray is projected on the concave mirror after that the light reflects and goes into the plane. So both plane and spherical mirror is used in these type of telescope the spherical mirror is a concave mirror

(d) Cassegrain telescope is also the telescope which uses the curve type of mirrors

(e) Light ray coming from the heavenly bodies that is the distant object get reflected by the concave mirror the light rays rather than converging at a point which usually they do because of concave they get reflected on the plane mirror as shown in the figure as a result the rays pass through the eyepiece and we get a magnified image of the body

Note:Many students may confuse between Cassegrain telescope and the Newtonian telescope as both of them has spherical mirror but newtonian telescope has concave mirror and the plane mirror while Cassegrain telescope has the combination of a primary concave mirror and a secondary convex mirror.