MCQ
An achromatic combination of lenses produce:
- AImages in black and white
- BColored images
- ✓Images unaffected by variation of refractive index with wavelength
- DHighly enlarged images
✓
Answer
Correct option: C.
Images unaffected by variation of refractive index with wavelength
An achromatic combination of lenses provide deviation without dispersion. So, images are unaffected by variation of refractive index with wavelength.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A convex lens $A$ of focal length $20 cm$ and a concave lens $B$ of focal length $5 cm$ are kept along the same axis with the distance $d$ between them. If a parallel beam of light falling on $A$ leaves $B$ as a parallel beam, then distance $d$ in $cm$ will be
→A potential difference of $300\, volts$ is applied to a combination of $2.0\,\mu F$ and $8.0\,\mu F$ capacitors connected in series. The charge on the $2.0\,\mu F$ capacitor is
→An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field $\vec{B}=B_0 \vec{k}$ which exists to the right of y-axis. The electron exits from the region after some time with the speed v at co-ordinate y, then
→The angular momentum of the electron in hydrogen atom in the ground state is:
Suppose the charge of a proton and an electron differ slightly. One of them is $-e,$ the other is $(e + \Delta e).$ If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distanced (much greater than atomic size) apart is zero, then $\Delta e$ is of the order of $[$ Given: mass of hydrogen $m_h = 1.67 \times 10^{- 27}\,\, kg]$
→A planet of mass $M$ has a satellite of mass m, revolving around the planet in a circular orbit of radius $r$ and time period $T$ . The mass $(M)$ of the planet is
→Which can pass through 20 cm thickness of the steel
What is the torque exerted by a bar magnet on itself due to its field?
$A\,\,{5\,^o}C$ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to ............. $^oC$
→$P-$ type semiconductor is formed when
→A. $As$ impurity is mixed in $Si$
B.$Al$ impurity is mixed in $Si$
C.$B$ impurity is mixed in $ Ge$
D.$P$ impurity is mixed in $Ge$