$(a)\;200\qquad(b)\;100\qquad(c)\;400\qquad(d)\;150$

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$$f_o = 1.2 cm $$

$$u_o = 1.25 cm $$

$$v_e = \infty $$

From , $$\displaystyle \frac{1}{u_o} + \frac{1}{v_o} = \frac{1}{f_o} $$,

we get $$\displaystyle \frac{1}{v_o} = \frac{1}{1.2} - \frac{1}{1.25}$$

$$v_o = 30$$ cm

Magnification of microscope $$\displaystyle m=\frac{v_o}{u_o} (1+\frac{D}{f_e})$$

$$\displaystyle m = \frac{30}{1.25} (1+\frac{25}{3}) \simeq 200 $$ .

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