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The focal length of objective and eye-piece of a microscope are 1 cm and 5 cm respectively. If the magnifying power for relaxed eye is 45, then length of the tube is

a)

9 cm

b)

15 cm

c)

12 cm

d)

6 cm

Question ID - 152412 :-

The focal length of objective and eye-piece of a microscope are 1 cm and 5 cm respectively. If the magnifying power for relaxed eye is 45, then length of the tube is

a)

9 cm

b)

15 cm

c)

12 cm

d)

6 cm

1 Answer
5876 Votes
3537
Answer Key : (b) -

(b)

For the relaxed eye, magnifying power is

For objective lens, image is real

Given, cm

Form 

10 cm

Length of the tube cm

Next Question :

Two plane mirrors are inclined to each other at an angle . A ray of light is reflected first at one mirror and then at the other. The total deviation of the ray is

a)

2

b)

c)

d)


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