0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

# Two plano-convex lenses of focal lengths f and 2f are coaxially separated so that the spherical aberration is minimized. The effective focal length of the combination is :3f2f3f44f3

A
3f4
B
3f2
C
f
D
4f3
Solution
Verified by Toppr

#### d=f2−f1=2f−f=ffeq=f1f2f1+f2−d=2f×ff+2f−f=f

0
Similar Questions
Q1
Two plano-convex lenses of focal lengths f and 2f are coaxially separated so that the spherical aberration is minimized. The effective focal length of the combination is :
View Solution
Q2
Two plano-convex lenses of same material and of focal lengths f and 2f are coaxially separated by a suitable distace to minimize chromatic aberration. The equivalent focal length of the combination is
View Solution
Q3
Two plano convex lenses of focal lengthsf1 andf2 set for minimising spherical aberration are kept apart by 2 cm. If the equivalent focal length of combination is 10 cm, the values of f1 and f2 are :
View Solution
Q4
Two plano convex lenses of same material and of focal lengths 20 cm & 5 cm should be arranged such that the combination is free from chromatic aberration. Then effective focal length of the combination will be:
View Solution
Q5
A biconvex lens of focal length f is cut into two plano convex lenses. If these two plano convex lenses are joined such that their convex surfaces are in contact, then the focal length of the combination is :
View Solution