CBSE Class 12 Sample Paper for 2022 Boards [Term 2] - Physics
Question 8 (Choice 1) - CBSE Class 12 Sample Paper for 2022 Boards [Term 2] - Physics - Solutions to CBSE Sample Paper - Physics Class 12
Last updated at April 4, 2022 by Teachoo
(a) Draw a ray diagram of a compound microscope for the final image formed at least distance of distinct vision?Β
Answer
Diagram of Compound Microscope for the final image formed at D
(b) An angular magnification of 30X is desired using an objective of focal length 1.25 cm and an eye piece of focal length 5 cm. How will you set up the compound microscope for the final image formed at least distance of distinct vision?Β
Question 8 (b) (Choice 1)
An angular magnification of 30X is desired using an objective of focal length 1.25 cm and an eye piece of focal length 5 cm. How will you set up the compound microscope for the final image formed at least distance of distinct vision?
π_0=30,π_0=1.25 ππ,π_π=5 ππ
When image is formed at least distance of distinct vision
D = 25 cm
Angular magnification of eyepiece
π_π=(1+π·/π_π )=1+25/5=6
Total Angular magnification,
π=π_π π_π
π_π=π/π_π =30/6=5
As the objective lens forms the real image,
π_π= π£_π/π’_π =β5
π£_π=β5π’_π
Using lens equation,
π’_π=β1.5 ππ
π£_π=β5Γ(β1.5)ππ
=7.5 ππ
Given π_π=βπ·=25 ππ, π_π=+5 ππ, π’_π= ?
using again lens equation π’_π=25/6
Thus, object is to be placed at 1.5 cm from the objective and separation between the two lenses should be
πΏ=π£_π+πΌπ’_π
π°=ππ.ππ cm
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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.