Q. A combination of two thin convex lenses of focal length 0.3 m and 0.1 m will have minimum spherical and chromatic aberrations if the distance between them is
A) 0.1 m
B) 0.2 m
C) 0.3 m
D) 0.4 m
Explanation
(c) Resolving power of the telescope is
$= \frac{a}{1.22ʎ}$
Where $a$ = diameter of aperture of objective lens
$\lambda$ = wavelength of light
Therefore, resolving power $\propto a$
As aperture of the objective lens increases, resolving power of telescope increases.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.