CBSE Class 12 Physics 2019 Outside Delhi Set 1 Paper

Question : 9 of 27

Marks: +1, -0

Draw the ray diagram of an astronomical telescope showing image formation in the normal adjustment position. Write the expression for its magnifying power.
OR
Draw a labelled ray diagram to show image formation by a compound microscope and write the expression for its resolving power.

Solution:

To draw the ray diagram of astronomical telescope
Expression for magnification
Ray diagram:

\;\;\text " Magnification "\;=\;{f_o}/{f_e}

\;\;\text " or "\; \;\; m=\;{β}/{α}

OR
To draw the ray diagram of compound microscope
Expression for resolving power

Resolving power

=\;{2 n sin \;β}/{1.22 λ}

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