In a compound microscope,the focal length of | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) For the objective lens,using the lens formula $\frac{1}{v_o} - \frac{1}{u_o} = \frac{1}{f_o}$:Given $u_o = -1.25 \ cm$ and $f_o = 1.2 \ cm$,we hav

Vedclass · Accepted Answer

$200$

Vedclass · Answer

(A) For the objective lens,using the lens formula $\frac{1}{v_o} - \frac{1}{u_o} = \frac{1}{f_o}$:Given $u_o = -1.25 \ cm$ and $f_o = 1.2 \ cm$,we have $\frac{1}{v_o} = \frac{1}{1.2} - \frac{1}{1.25} = \frac{1.25 - 1.2}{1.5} = \frac{0.05}{1.5} = \frac{1}{30}$.So,$v_o = 30 \ cm$.The magnification of the objective lens is $m_o = \frac{v_o}{u_o} = \frac{30}{-1.25} = -24$.For the eyepiece,when the final image is at infinity,the magnifying power is $m_e = \frac{D}{f_e}$,where $D = 25 \ cm$ is the least distance of distinct vision.$m_e = \frac{25}{3.0} = \frac{25}{3} \approx 8.33$.The total magnifying power $M = m_o 	imes m_e = -24 	imes \frac{25}{3} = -8 	imes 25 = -200$.The magnitude of the magnifying power is $|M| = 200$.

Similar Questions

Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms is used to denote such species?

$A$ nucleus ruptures into two nuclear parts which have their velocity ratio equal to $2:1$. What will be the ratio of their nuclear size (nuclear radius)?

Which of the following is paramagnetic?

The following figure shows the multiple reflections of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point $P$ is $30^o$,what are the angles of reflection of the light ray at points $Q, R, S$,and $T$ respectively?

Vedclass Test Series

Exam Paper Generator

Online Exam Module