Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

Define and write expression for magnifying power of an astronomical telescope in normal adjustment (i,e, when the final image is formed at infinity)  
Asked by khanhill543 | 31 Dec, 2020, 00:20: AM
answered-by-expert Expert Answer
Light from a distant object enters the objective and a real image is formed in the tube at its second focal point.
The eyepiece magnifies this image producing a final inverted image.
The magnifying power m is the ratio of the angle β subtended at the eye by the final image to the angle α which
the object subtends at the lens or the eye.
 
Hence magnifying power m is given as ,  

begin mathsize 14px style m space almost equal to space beta over alpha space almost equal to space h over f subscript e cross times f subscript o over h space equals f subscript o over f subscript e end style
where fo is focal length of objective lens and fe is focal length of eye piece

Answered by Thiyagarajan K | 31 Dec, 2020, 10:04: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
Optical instrument
question image
Asked by tannudahiya80536 | 20 Dec, 2022, 13:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
derive the expression for the magnifying Power and the length of a compound microscope using two convex lenses.
Asked by kamleshstarone392 | 16 Apr, 2022, 06:26: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
derive an expression for the magnifying power of an astronomical telescope in normal adjustment?
Asked by shijurlytepz | 12 Oct, 2021, 18:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Define and write expression for magnifying power of an astronomical telescope in normal adjustment (i,e, when the final image is formed at infinity)  
Asked by khanhill543 | 31 Dec, 2020, 00:20: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Find the maximum magnifying power of a compound microscope having a 25 diopter lens as the objective, a 5 diopter lens as the eyepiece and the separation 30 cm between the two lenses. The least distance for clear vision is 25 cm.
Asked by ABHILASHA | 15 Sep, 2020, 18:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
the magniuifying power of a telescope is 9. when it adjusted for parallel rays the didtance b/w the eye piece and  objective lens is 20cm find the focal length of both lenses
Asked by akgujrati04 | 22 Aug, 2020, 19:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
which mirror does used in microscope and why?
Asked by mazhartahsildar143 | 02 May, 2020, 13:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Is combination of a mirror and lens in syllabus of class 12? 
Asked by govtsecschoolnayaganv051 | 24 Feb, 2020, 16:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Derivation of compound microscope
Asked by phenomenal1ajisback | 20 Feb, 2020, 20:08: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
astronomical telesccope  with full explaination
Asked by singhalakash8958 | 03 Mar, 2019, 22:11: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt