Ask a Doubt
Request a call back

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

CBSE Class 10 Answered

If a convex lens iis enlongated , then how the focal length and thickness will decrease or increse?what is curvature in lens here?
Asked by sucharitasahoo1 | 24 Dec, 2017, 12:52: AM
answered-by-expert Expert Answer
if the amount of material of lens is constant and if the lens is elongated, naturally thickness will decrease. Also radius of curvature of spherical surfacees increase.
Let us consider the lens-makers equation begin mathsize 12px style 1 over f equals open parentheses mu minus 1 close parentheses open parentheses fraction numerator 1 over denominator R 1 end fraction minus space fraction numerator 1 over denominator R 2 end fraction close parentheses end style
f is focal length, μ is refractive index of lens material, R1 and R2 are radii of curvature.
by assuming the cartesian sign convention( R2 is negative, left side radius of curvature) and assuming R1 = R2=R,
we get begin mathsize 12px style f space equals space fraction numerator 1 over denominator mu minus 1 end fraction R over 2 end style
that shows the focal length increases
Answered by | 24 Dec, 2017, 09:54: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
the violet light have smaller wave length then blue light so why the sky colour is not violet?
Asked by saritavishwakarma1986 | 04 Jan, 2024, 12:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Arrange the parts in one order from the fornt of the eya
Asked by abhishekuppala598 | 06 Feb, 2022, 09:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
What is Iris explain IN detail
Asked by tarsemsingh70273 | 03 Jun, 2020, 06:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
give solution of this question
question image
Asked by suhanirao1702 | 30 May, 2020, 10:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is yellow spot in human eye??
Asked by shivajihake1970 | 07 Apr, 2020, 11:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Amit suffering from myopia is not able to see distantly the objects placed beyond five from his eyes. List possible reason due to which this defect of vision may have a rising. With the help of a diagram explain;   (a) why the student is unable to see the           objects placed beyond 5 metre.  (b) type of corrective lens used to restore        proper vision and how is defect is                corrected by the use of this lens.  (C) if in this case,  the numerical value of the focal length of the corrective lens is 5 metre find the power of the lens as per the new cartesian sign convention
Asked by mdfaizmgr186 | 14 Jan, 2020, 10:21: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
why do things appear unclear when we enter a dark room from outside?
Asked by akashdeepsandhu2106 | 06 Jan, 2020, 06:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Is the distance between lens and retina of the eye always remains the same?    
Asked by Vishalgarg12345678 | 10 Oct, 2019, 05:15: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Is focal length of eye lens fixed?
Asked by saradamahapatra9999 | 15 Mar, 2019, 10:24: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
What is accomdation of eye
Asked by mirtowfeeq21 | 21 Feb, 2019, 10:09: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×