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A compound microscope has an objective …

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A compound microscope has an objective of focal length 1.25 cm and eyepiece of focal length 5cm. a small object is kept at 2.5cm from the objective. if the final image formed is at infinity, find the distance between objective and eyepiece.
  • 3 answers

Harsh Mishra 4 years, 9 months ago

He is a teacher dude or just say a RoboT. He answers just those question whose answer you can get online to but not of the hard ones, Right Mr. Gaurav?? tum khud dekh lena woh reply nahi karega sorry KARENGE no...

Maria Anna Alwin 4 years, 9 months ago

Thank you soooo much Gaurav !!!

Gaurav Seth 4 years, 9 months ago

◆ Answer -

L = 7.5 cm

 

● Explanation -

# Given -

fo = +1.25 cm

fe = +5 cm

uo = -2.5 cm

ve = ∞

 

# Solution -

Applying lens formula for objective,

1/fo = 1/vo - 1/uo

1/1.25 = 1/vo - 1/-2.5

1/vo = 1/25 - 1/2.5

1/vo = 1/2.5

vo = 2.5 cm

 

Applying lens formula for eyepiece,

1/fe = 1/ve - 1/ue

1/5 = 1/∞ - 1/ue

1/5 = 0 - 1/ue

ue = -5 cm

 

Distance between the objective and eyepiece is -

L = |vo| + |ue|

L = |2.5| + |-5|

L = 2.5 + 5

L = 7.5 cm

 

Hence, distance between the objective and eyepiece is 7.5 cm.

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