Request a call back

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

CBSE Class 12-science Answered

what will be the focal lenght of the lens if radii of curvature of two surfaces were equal in magnitude and also had the same sign?
Asked by Jahanvi | 08 Oct, 2015, 07:41: PM
answered-by-expert Expert Answer
The focal length of a lens is related to the radii of curvatures according to the lens maker's formula as:
 
begin mathsize 14px style 1 over straight f equals open parentheses straight n minus 1 close parentheses open parentheses 1 over straight R subscript 1 minus 1 over straight R subscript 2 close parentheses end style
Now, if R1 = R2 both in magnitude and sign, then begin mathsize 14px style 1 over straight R subscript 1 minus 1 over straight R subscript 2 equals 0 end style
Therefore, 1/f = 0 and so f = ∞

This scenario is however not feasible practically and both R1 and R2 will have opposite signs or they will have different magnitudes if they are of the same sign.
Answered by Romal Bhansali | 09 Oct, 2015, 12:28: PM
CBSE 12-science - Physics
Asked by santhoshsindoora | 27 Sep, 2023, 08:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by marvellouskyndiah | 17 May, 2023, 08:07: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by bmahalik21 | 04 Mar, 2023, 07:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by hanskaraja | 05 Aug, 2022, 11:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by Dark | 05 Jan, 2022, 11:54: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by nagendramanikireddy999999 | 29 May, 2021, 11:50: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by manjulamurali1979 | 19 May, 2020, 09:01: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by tyeswanthkumar37 | 14 May, 2020, 10:58: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by polyrelation | 15 Mar, 2019, 04:40: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by polyrelation | 15 Mar, 2019, 04:40: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×