A double convex lens made out of glass (refractive index $\mu = 1.5)$ has both radii of curvature of magnitudes 20 cm. Incident light rays parallel to the axis of this lens will converge at a distance $d$ such that

Question

Dr. Abubacker · Accepted Answer

(d) Use $d = f;$ where, $\frac{1}{f} = (\mu - 1)\frac{2}{R} = (1.5 - 1) 	imes \frac{2}{20} = \frac{1}{20}$
$\Rightarrow f = 20\ cm$

Q. A double convex lens made out of glass (refractive index $\mu = 1.5)$ has both radii of curvature of magnitudes 20 cm. Incident light rays parallel to the axis of this lens will converge at a distance $d$ such that

Explanation

Reviewed by Dr. Abubacker

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