Question

Magnification of a compound microscope is 30. Focal length of eye - piece is 5 cm and image is formed at a distance of 25 cm from eye - piece. The magnification of objective lens is –

• A. 6
• B. 5
• C. 7.5
• D. 10

Answer 1

Answer: (B)

5

Answer 2

MP = m_o × m_e

m_e = 1 + = $\frac { 1 + 25 } { 5 }$= 6

\ 30 = m_o × 6

Ž m_o = 5