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.
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