Physics, asked by munawar786, 1 year ago

how can we find focal length of lens?

Answers

Answered by prmkulk1978
0
The focal length of the lens an be found out experimentally by any of the following two methods.
1..Distant object method
2. u- v method
Answered by Kuldeepnehra
1
Focal length of lens can be found by the formula:- 1/f=(n-1) x 1/R For example:- If the radius of curvature of the curved face of a thin plano-convex lens is 10 cm and it is made of glass of refractive Index 1.5. Then:- 1/f=(n-1) x 1/R Here n=1.5 & R =10 So:- 1/f =(1.5-1)x1/10 Or 1/f=0.5/10 Or 1/f=5/100=1/20 Hence f= 20 cm This is the easiest way to calculate focal length of a lens. Hope it will be helpful to understand in easiest way.
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