SATHEE: Optics Question 348

Optics Question 348

Question: The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is

[MP PMT 1991]

Options:

A) 200 cm

B) 160 cm

C) 2.5 cm

D) 0.1 cm

Show Answer

Answer:

Correct Answer: C

Solution:

If nothing is said then it is considered that final image is formed at infinite and $m_{\infty} = \frac{(L_{\infty} - f_{o} - f_{e}) . D}{f_{o} f_{e}} \underset{―}{\tilde{}} \frac{L D}{f_{0} f_{e}}$

$\Rightarrow 400 = \frac{20 \times 25}{0.5 \times f_{e}} \Rightarrow f_{e} = 2.5 c m .$

Optics Question 348

Question: The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Optics Question 348

Question: The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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