Question

The focal lengths of the objective and eye piece of a compound microscope are 1 cm and 5 cm respectively. An object is placed at a distance of 1.1 cm from objective. If final image is formed at least distance of distinct vision, the magnifying power is –

• A. 60
• B. 50
• C. 40
• D. None of these

Answer 1

Answer: (A)

60

Answer 2

– $\frac { 1 } { - 1.1 }$ = $\frac { 1 } { + 1 }$ Ž v₀ = + 11 cm

\ MP = = $\frac { 11 } { 1.1 } \left( 1 + \frac { 25 } { 5 } \right)$ = 60