The focal length of a convex lens is 10 cm. The magnifying powers when it is used as a magnifying glass to form the image at (i) near point and (ii) far point are :
2.5, 3.5
4.5, 3.5
3.5, 4.5
3.5, 2.5

Question

The focal length of a convex lens is 10 cm- The magnifying powers when it is used as a magnifying glass to form the image -i- near point and -ii- far point are -2-5- 3-54-5- 3-53-5- 4-53-5- 2-5

Toppr Admin · Accepted Answer

For the near point- magnification- m1-1-DfFor the far point- m2-DfThus- putting D-25 and f-10We get- m1-3-5 -xA0- and -xA0- m2-2-5

The focal length of a convex lens is 10 cm. The magnifying powers when it is used as a magnifying glass to form the image at (i) near point and (ii) far point are :2.5, 3.54.5, 3.53.5, 4.53.5, 2.5

For the near point, magnification, m1=1+DfFor the far point, m2=DfThus, putting D=25 and f=10We get, m1=3.5 and m2=2.5

The focal length of a convex lens is 10 cm. The magnifying powers when it is used as a magnifying glass to form the image at (i) near point and (ii) far point are :
2.5, 3.5
4.5, 3.5
3.5, 4.5
3.5, 2.5

For the near point, magnification, $m_{1} = 1 + \frac{D}{f}$

For the far point, $m_{2} = \frac{D}{f}$

Thus, putting $D = 25$ and $f = 10$

We get, $m_{1} = 3.5$ and $m_{2} = 2.5$