Question
Define the magnification of a spherical mirror.
✓
Answer
Magnification (m): The ratio of the size of the image $\left(h^{\prime}\right)$ and the size of the object $(h)$ is called the magnification of the spherical mirror, i.e.
$m=\frac{\text { Size of image }\left(h^{\prime}\right)}{\text { Size of object }(h)}$
$\Rightarrow \quad m=\frac{h^{\prime}}{h}=-\frac{v}{u}$
$m=\frac{\text { Size of image }\left(h^{\prime}\right)}{\text { Size of object }(h)}$
$\Rightarrow \quad m=\frac{h^{\prime}}{h}=-\frac{v}{u}$
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
Answer the following:
The discharging current in the atmosphere due to the small conductivity of air is known to be 1800A on an average over the globe. Why then does the atmosphere not discharge itself completely in due course and become electrically neutral? In other words, what keeps the atmosphere charged?
The discharging current in the atmosphere due to the small conductivity of air is known to be 1800A on an average over the globe. Why then does the atmosphere not discharge itself completely in due course and become electrically neutral? In other words, what keeps the atmosphere charged?
Answer the following question: As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?
Figure shows a conducting circular loop of radius a placed in a uniform, perpendicular magnetic field B. A thick metal rod OA is pivoted at the centre O. The other end of the rod touches the loop at A. The centre O and a fixed point C on the loop are connected by a wire OC of resistance R. A force is applied at the middle point of the rod OA perpendicularly, so that the rod rotates clockwise at a uniform angular velocity $\omega.$ Find the force.
→Find the maximum angle of refraction when a light ray is refracted from glass $(\mu=1.50)$ to air.
→A high jumper successfully clears the bar. Is it possible that his centre of mass crossed the bar from below it? Try it with appropriate figures.
In the decay $^{64}Cu \rightarrow ^{64}Ni + e^+ + v,$ the maximum kinetic energy carried by the positron is found to be $0.650\ MeV.$
→- What is the energy of the neutrino which was emitted together with a positron of kinetic energy $0.150\ MeV?$
- What is the momentum of this neutrino in $kg-m/s?$
A barometer correctly reads the atmospheric pressure as 76cm of mercury. Water droplets are slowly introduced into the barometer tube by a dropper. The height of the mercury column first decreases and then becomes constant. lf the saturation vapour pressure at the atmospheric temperature is 0.80cm of mercury, find the height of the mercury column when it reaches its minimum value.
In a Michelson experiment for measuring speed of light, the distance travelled by light between two reflections from the rotating mirror is $4.8\ km.$ The rotating mirror has a shape of a regular octagon. At what minimum angular speed of the mirror $($other than zero$)$ the image is formed at the position where a non$-$rotating mirror forms it?
→A person wears glasses of power -2.5D. Is the person farsighted or nearsighted? What is the far point of the person without the glasses?
A small town with a demand of 800kW of electric power at 220V is situated 15km away from an electric plant generating power at 440V. The resistance of the two wire line carrying power is 0.5Ω per km. The town gets power from the line through a 4000-220V step-down transformer at a sub-station in the town.
- Estimate the line power loss in the form of heat.
- How much power must the plant supply, assuming there is negligible power loss due to leakage?
- Characterise the step up transformer at the plant.