Question
Assertion $(A):$ The relation among $u , v$ and $f$ for the spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.

Reason $(R):$ The laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.

Answer

(a)

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

The mass of a lift is $2000\, kg.$ When the tension in the supporting cable is $28000 \,N,$ then its acceleration is 
The position of the image formed by the combination of lenses is :

$\mathrm{f}_1=10 \mathrm{~cm} \quad \mathrm{f}_2=10 \quad \mathrm{f}_3=30 \mathrm{~cm}$

The surface energy of liquid film on a ring of area $0.15\;{m^2}$ is ....... $J$ (Surface tension of liquid $ = 5\,N{m^{ - 1}})$
By Huygen's wave theory of light, we cannot explain the phenomenon of
A solid sphere of radius $R$ gravitationally attracts a particle placed at $3 R$ form its centre with a force $F _{1}$. Now a spherical cavity of radius $\left(\frac{ R }{2}\right)$ is made in the sphere (as shown in figure) and the force becomes $F _{2}$. The value of $F _{1}: F _{2}$ is
One end of a spring of negligible unstretched length and spring constant $k$ is fixed at the origin $(0,0)$. A point particle of mass $m$ carrying a positive charge $q$ is attached at its other end. The entire system is kept on a smooth horizontal surface. When a point dipole $\overrightarrow{ p }$ pointing towards the charge $q$ is fixed at the origin, the spring gets stretched to a length $\ell$ and attains a new equilibrium position (see figure below). If the point mass is now displaced slightly by $\Delta \ell \ll \ell$ from its equilibrium position and released, it is found to oscillate at frequency $\frac{1}{\delta} \sqrt{\frac{k}{m}}$. The value of $\delta$ is. . . . . . 
A telescope has an objective lens of $10\, cm$ diameter and is situated at a distance of $1\, km$ from two objects. The minimum distance between these two objects which can be resolved by the telescope, when the mean wavelength of light is $5000\,\mathop A\limits^o $, is the order of
In the given figure, there is a circuit of potentiometer of length $A B=10 \,{m}$. The resistance per unit length is $0.1 \,\Omega$ per ${cm}$. Across ${AB}$, a battery of emf ${E}$ and internal resistance ' ${r}^{\prime}$ is connected. The maximum value of emf measured by this potentiometer is : (In $V$)
Select incorrect statement regarding mechanical energy of a body/system
Speed of light is maximum in