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CBSE Class 12 Physics 2019 Outside Delhi Set 1 Paper

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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:
     Magnification   =  fofe\;\; \text{ Magnification } \; = \; \frac{f_o}{f_e}
     or       m=  βα\;\; \text{ or } \;\;\; m = \; \frac{\beta}{\alpha}
OR
To draw the ray diagram of compound microscope
Expression for resolving power
Resolving power =  2nsin⁡β1.22λ= \; \frac{2 n \sin \beta}{1.22 \lambda}
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