91Ó°ÊÓ

The index of refraction where the object is located is$n_1=1.0$.

The index of refractionon the other side of the refracting surface,$n_2=1.5$.

The object distance,$p=+10$

The image distance,$i=-13$

The index of refraction of the object and image, the object distance, and theimage distanceare given in the problem. Using this data and equation $\mathbf{34}\mathbf{-}\mathbf{8}$, find the radius of curvatureand check whetherthe image is real or virtual and find the position of the image.

Formula are as follows:

$\frac{{\mathbf{n}}_{\mathbf{1}}}{\mathbf{p}}\mathbf{+}\frac{{\mathbf{n}}_{\mathbf{2}}}{\mathbf{i}}\mathbf{=}\frac{{\mathbf{n}}_{\mathbf{2}}\mathbf{-}{\mathbf{n}}_{\mathbf{1}}}{\mathbf{r}}$ . . .(34-5)

Where,$\mathit{p}$is the pole,$\mathit{i}$is the image distance.

(a)

The index of refractionon the other side of the refracting surfaceis given in the table $34-5$. So,$n_2=1.5$

Therefore, the index of refraction $n_2$on the other side of the refracting surface is$1.5$.

(b)

Theobject distance is given in the problem,$p=+10cm$.

Therefore, the object distance $p$is $+10\mathrm{cm}$.

(c)

Fromequation $34-8$,
$\frac{n_1}{p}+\frac{n_2}{i}=\frac{n_2-n_1}{r}$

Rearranging the terms,

$r=\frac{\left(n_2-n_1\right)}{\left(\frac{n_1}{p}+\frac{n_2}{i}\right)}$

Substituting the given values,

$r\text{=}\frac{\left(\text{1.5 - 1.0}\right)}{\left(\frac{\text{1.0}}{\text{10cm}}\text{+}\frac{\text{1.5}}{\text{- 13cm}}\right)}$

$r=-32.5≈-\text{33cm}$

Therefore, the radius of curvature $r$of the surface is $-33\mathrm{cm}$.

(d)

The image distance is given in the problem,$i=-13cm$.

Therefore, the image distance $i$is $-13\mathrm{cm}$.

(e)

Since$i<0$, therefore the image is virtual and upright.

Therefore, the image is virtual and upright.

(f)

For spherical refracting surfaces, real images form on the opposite sides of the object and virtual images form on the same side as the object.

Since the image is virtual, therefore theimage is on the same side as that of the object.

Therefore, the image is on same side as that of the object.

The required quantities can be found by using the relation between the index of refraction of object and image, image distance, object distance, and the radius of curvature.