Two thin lenses whose powers are +2 ;D and -4 ;D respectively com… - Vidyadip

MCQ

Two thin lenses whose powers are $+2\;D$ and $-4\;D$ respectively combine, then the power of combination is

✓
– 2D
B
+ 2D
C
– 4D
D
+ 4D

✓

Answer

Correct option: A.

– 2D

a
( a)$P = {P_1} + {P_2} = 2D - 4D = - 2D.$

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

Explore more

More "M.C.Q (1 Marks)" from 9. Ray optics abd optical instruments→9. Ray optics abd optical instruments — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

If two soap bubbles of different radii are connected by a tube:

A planar loop made of wire is rotating in a uniform magnetic field. At time $t=0$, the plane of the loop is perpendicular to the magnetic field. If the loop is rotating about an axis passing through its plane with a period of $10$ seconds, at which of the following times will the induced electromotive force (emf) be maximum and minimum, respectively?

The electrochemical equivalent of a metal is $ 3.3\times 10^{-7} $ kg/coulomb . The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds will be

${U^{238}}$ decays into $T{h^{234}}$ by the emission of an $\alpha - $ particle. There follows a chain of further radioactive decays, either by $\alpha - $ decay or by $\beta $ - decay. Eventually a stable nuclide is reached and after that, no further radioactive decay is possible. Which of the following stable nuclides is the and product of the ${U^{238}}$ radioactive decay chain

A square card of side length $1\, mm$ is being seen through a magnifying lens of focal length $10\, cm$. The card is placed at a distance of $9\, cm$ from the lens. Axis is perpendicular to the plane of card. The apparent area of the card through the lens is......$cm^2$

The combination of a convex lens (f = 18 cm) and a thin concave lens (f = 9 cm) is

Assertion : In Young’s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper.
Reason : The cellophane paper decrease the wavelength of light.

The electric field at a point on equatorial line of a dipole and direction of the dipole moment:

The pn junction can be formed by which of the following methods?

If the direction of the initial velocity of the charged particle is perpendicular to the magnetic field, then the orbit will be or The path executed by a charged particle whose motion is perpendicular to magnetic field is