Download App

Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments1 Mark
MCQ
In image formation from spherical mirrors, only paraxial rays are considered because they:
  • A
    Are easy to handle geometrically.
  • B
    Contain most of the intensity of the incident light.
  • ✓
    Form nearly a point image of a point source.
  • D
    Show minimum dispersion effect.
✓

Answer

Correct option: C.
Form nearly a point image of a point source.

In Image formation from spherical mirrors, only paraxial rays are considered because they form nearly a point Image of a point source. Angle of Incidence of Paraxial rays is very small.

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 Ray Optics and Optical Instruments→Ray Optics and Optical Instruments — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Twists of suspension fibre should be removed in vibration magnetometer so that
→
If a coil of metal wire is kept stationary in a non-uniform magnetic field, then
→
If the separation between slits in Young’s double slit experiment is reduced to $\frac{1}{3}$rd, the fringe width becomes n times. The value of n is
→
A sine wave is travelling in a medium. The minimum distance between the two particles, always having same speed, is:
→
Huygen wave theory allows us to know
→
A parallel plate capacitor has a capacitance $\mathrm{C}=200 \mathrm{pF}$. It is connected to $230 \mathrm{~V}$ ac supply with an angular frequency $300 \mathrm{rad} / \mathrm{s}$. The $\mathrm{rms}$ value of conduction current in the circuit and displacement current in the capacitor respectively are :
→
A potentiometer having the potential gradient of $2\, mV/cm$ is used to measure the difference of potential across a resistance of $10 \,\Omega$. If a length of $50\, cm$ of the potentiometer wire is required to get the null point, the current passing through the $10 \,\Omega$ resistor is (in $mA$)
→
Isotopes of an element contain:
→
Heater of electric kettle is made of a wire of length $L$ and diameter $d$. It takes $4$ minutes to raise the temperature of $0.5 \ kg$ water by $40\ K$. This heater is replaced by a new heater having two wires of the same material, each of length $L$ and diameter $2 d$. The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by $40K$ ?

$(A)$ $4$ if wires are in parallel

$(B)$ $2$ if wires are in series

$(C)$ $1$ if wires are in series

$(D)$ $0.5$ if wires are in parallel.

→
A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like:
→