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A person with normal near point 25 cm us...

A person with normal near point 25 cm using a compound microscope with objective of focal length `8.0 mm` and an eye piece of focal length 2.5 cm can bring an object placed at `9.0 mm` from the objective in sharp focus. The separation between two lensese and magnification respectively are

A

7.20 cm

B

9.47 cm

C

2.27 cm

D

4.93 cm

Text Solution

Verified by Experts

The correct Answer is:
B
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A person with a normal near point (25 cm) using a compound microscope with an objective of focal length 8.0 mm and eye piece of focal length 2.5 cm can bring an object placed 9.0 cm from the objective in sharp focus. What is the separation between the two lenses ? Calculate the magnifying power of the microscope ?

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Knowledge Check

  • A person with a normal near point (25 cm) using a compound microscope with an objective of focal length 8.0 mm and eye piece of focal length 2.5 cm can bring an object placed 9.0 cm from the objective in sharp focus. What is the separation between the two lenses ? Calculate the magnifying power of the microscope ?

    A
    `9.47 cm, 88`
    B
    `3.36 cm, 44`
    C
    `6.00 cm, 22`
    D
    `4.79 cm, 11`

  • A small telescope has an objective lens of focal length 144 cm and an eye-piece of focal length 6.0 cm . What is the magnifying power of the telescope ? What is the separation between the objective and the eye-piece ?

    A
    `0.75 cm`
    B
    `1.38 cm`
    C
    `1.0 m`
    D
    `1.5 m`

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