CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
Question

In a compound microscope, the focal length of the objective lens is 1.2 cm and the focal length of the eyepiece is 3 cm. When the object is kept at 1.25 cm in front of the objective lens, the final image is formed at infinity. The magnifying power of the compound microscope is -

A
400
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
200
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
150
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
100
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 200
Given:
fo=1.2 cm
fe=3 cm
uo=1.25 cm

Using lens formula for objective lens,

1vo1uo=1fo

1vo1(1.25)=11.2

vo=30 cm

Now, magnifying power of the compound microscope when the final image is formed at infinity,

m=vo|uo|(Dfe)

m=301.25(253)=200

Hence, option (B) is the correct answer.

flag
Suggest Corrections
thumbs-up
0
BNAT
mid-banner-image