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Refraction takes place at a concave spherical boundary separating glass air medium. For image to be real the object distance $(\mu g=\large\frac{3}{2})$

(a) Should be greater than 3 times the radius of curvature of refracting surface.

(b)Should be greater than 2 times the radius of curvature of refracting surface.

(c) Should be greater than radius of curvature of refracting surface.

(d)Is independent of radius of curvature of refracting surface

Can you answer this question?
 
 

1 Answer

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Applying $\large\frac{\mu_2}{v}- \frac{\mu_1}{u}=\frac{\mu_2 -\mu_1}{R}$
$\large\frac{1}{v}-\frac{1.5}{(-u)}=\frac{(1-(1.5)}{-R}$
or $\large\frac{1}{v}+ \frac{3}{2u}=\frac{1}{2R}$
For v take +ve $\large\frac{1}{2R} > \frac{3}{2u}$
or $u > 3R$
Hence a is the correct answer.
answered Feb 19, 2014 by meena.p
 

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