Q. A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution ?

A) Yellow
B) Green
C) Blue
D) Red
Explanation

[Solution from source] Resolving power improves as the wavelength gets shorter (the resolution limit is about 0.61λ/NA). Blue has the shortest wavelength of the colours listed, so it gives the finest resolution. Red has the longest wavelength and gives the poorest. Answer (3).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

Want to attempt the full paper?
View Full Paper Take Full Paper Online