MCQ
Chromatic aberration of lens can be corrected by
  • A
    Reducing its aperature
  • B
    Proper polishing of its two surfaces
  • Suitably combining it with another lens
  • D
    Providing different suitable curvature to its two surfaces

Answer

Correct option: C.
Suitably combining it with another lens
c
(c)

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A series $LCR$ circuit of $R=5\, \Omega, L=20\, {mH}$ and ${C}=0.5 \,\mu \,{F}$ is connected across an ${AC}$ supply of $250\, V$, having variable frequency. The power dissipated at resonance condition is $.....\,\times 10^{2}\, {W}$
The current in a triode at anode potential $100\,V$ and grid potential $-1.2 \,V is 7.5 \,mA$. If grid potential is changed to $ -2.2\, V$, the current becomes $5.5\, mA$. the value of trans conductance (gm) will be....$mili\, mho$
The equation $E = pc$ is valid:
The magnetic induction at the centre of a current carrying circular coil of radius $10\, cm$ is $5\sqrt 5 \,times$ the magnetic induction at a point on its axis. The distance of the point from the centre of the coil (in $cm$) is
Two springs $A$ and $B(k_A= 2k_B)$ are stretched by applying forces of equal magnitudes at the four ends. If the energy stored in $A$ is $E,$ that in $B$ is:
When radiation of wavelength $\lambda$ is used to illuminate a metallic surface, the stopping potential is $V.$ When the same surface is illuminated with radiation of wavelength $3 \lambda,$ the stopping potential is $\frac{ V }{4} .$ If the threshold wavelength for the metallic surface is $n \lambda$ then value of $n$ will be......
In a Young’s double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is $1/8^{th}$ of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to
Considering the following circuit, select the correct alternative
The potential difference between point A & B is

A current of $2\,A$ flows through a $2\,\Omega$ resistor when connected across a battery. The same battery supplies a current of $0.5\,\, A$ when connected across a $9 \,\,\Omega$ resistor. The internal resistance of the battery is