question_answer

Physics teacher Mr. Hassan has given three lenses of power 2D, 4D and 10D to a student Ramesh. Ramesh was not sure as to which lenses would he use for constructing   a   good   astronomical telescope. So, he consults his seniors and the teacher and then constructs a telescope. Later, he shows this telescope to the junior classes and explain about the choice of lenses.

Read the above passage and give the answer of the following questions.

(i) What values has Ramesh shown by doing these?

(ii) Which lenses are used as objective and which one as eyepiece?

(iii) Write two applications of astronomical telescope.

Answer:

\[60{}^\circ \]

(i) The values shown by him are as follows

(a) Consulting others in case of need

(b) Curiosity

(c) Sharing knowledge

(ii) From these three lenses, he will use a lens of power 0.5 D for objective and lens of power 10 D for eyepiece.

(iii) (a) For observing heavenly bodies.

(b) For observing eclipse, i.e. solar, lunar.