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 May 29, 2023 by Teachoo
(a) Draw a ray diagram of a compound microscope for the final image formed at least distance of distinct vision?
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?
Answer
Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class
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?
𝑚_0=30,𝑓_0=1.25 𝑐𝑚,𝑓_𝑒=5 𝑐𝑚
When image is formed at least distance of distinct vision
D = 25 cm
Angular magnification of eyepiece
𝑚_𝑒=(1+𝐷/𝑓_𝑒 )=1+25/5=6
Total Angular magnification,
𝑚=𝑚_𝑜 𝑚_𝑒
𝑚_𝑜=𝑚/𝑚_𝑒 =30/6=5
As the objective lens forms the real image,
𝑚_𝑜= 𝑣_𝑜/𝑢_𝑜 =−5
𝑣_𝑜=−5𝑢_𝑜
Using lens equation,
𝑢_𝑜=−1.5 𝑐𝑚
𝑣_𝑜=−5×(−1.5)𝑐𝑚
=7.5 𝑐𝑚
Given 𝑉_𝑒=−𝐷=25 𝑐𝑚, 𝑓_𝑒=+5 𝑐𝑚, 𝑢_𝑒= ?
using again lens equation 𝑢_𝑒=25/6
Thus, object is to be placed at 1.5 cm from the objective and separation between the two lenses should be
𝐿=𝑣_𝑜+𝐼𝑢_𝑒
𝑰=𝟏𝟏.𝟔𝟕 cm
Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.
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