Question

What is the angular magnification of a simple microscope when the image is formed at infinity?

विकल्प

• \[m = \frac{\theta_i}{\theta_o} = \left(1 + \frac{D}{f}\right)\]

• \[m = \frac{\theta_i}{\theta_o} = \frac{f}{D}\]

• \[m = \frac{\theta_i}{\theta_o} = \frac{D}{f}\]

• \[m = \frac{\theta_i}{\theta_o} = \left(1 - \frac{D}{f}\right)\]

Answer 1

When the image is at infinity, the angular magnification is \[m = \frac{\theta_i}{\theta_o} = \frac{D}{f}\], where \[\theta_i = h/f\] is the angle subtended by the image and \[\theta_o = h/D\] is the maximum angle the object subtends without the lens at the near point.