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A double convex thin lens made out of glass Refractive index is 1.5 has both radii of curvature of magnitude 20cm. Incident rays parallel to the axis of lens will converge at distance d cm such that.

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A double convex thin lens made out of glass Refractive index is 1.5 has both radii of curvature of magnitude 20cm. Incident rays parallel to the axis of lens will converge at distance d cm such that.

Asked by advguptaneeraj4 4th May 2015, 4:22 PM
Answered by Expert
Answer:

Hi Vishesh Gupta,

we know that:

begin mathsize 12px style 1 over straight f equals fraction numerator left parenthesis straight mu minus 1 right parenthesis over denominator straight R end fraction 1 over straight f equals space left parenthesis 1.5 minus 1 right parenthesis space open parentheses 1 over 20 plus 1 over 20 close parentheses 1 over straight f equals 0.5 cross times 1 over 10 1 over straight f equals 1 over 20 straight f equals 20 cm end style

Thus, the incident rays will converge at a distance 20 cm.

Answered by Expert 4th May 2015, 6:19 PM
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