JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
Two identical objects are placed in front of convex mirror and concave mirror having same radii of curvature of 12 cm , at same distance of 18 cm from the respective mirrors. The ratio of sizes of the images formed by convex mirror and by concave mirror is :
- A \(1 / 2\)
- B 2
- C 3
- D \(1 / 3\)
Answer & Solution
Correct Answer
(A) \(1 / 2\)
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \text { Using } m=\frac{f}{u-f} \\ & m_1=\frac{6}{18-6}=\frac{1}{2}\end{aligned}\) \(\mathrm{m}_2=\frac{6}{18+6}=\frac{1}{4} \quad \therefore \frac{\mathrm{~m}_2}{\mathrm{~m}_1}=\frac{1}{2}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- For extrinsic semiconductors; when doping level is increased;JEE Mains 2021 Medium
- A positive charge particle of \(100 \,mg\) is thrown in opposite direction to a uniform electric field of strength \(1 \times 10^{5} \,NC ^{-1}\). If the charge on the particle is \(40 \,\mu C\) and the initial velocity is \(200 \,ms ^{-1}\), how much distance (in \(m\)) it will travel before coming to the rest momentarilyJEE Mains 2022 Medium
- During an adiabatic process, if the pressure of a gas is found to be proportional to the cube of its absolute temperature, then the ratio of \(\frac{C_p}{C_V}\) for the gas is _______.JEE Mains 2024 Hard
- A point charge causes an electric flux of \(-2 \times 10^4 \mathrm{Nm}^2 \mathrm{C}^{-1}\) to pass through a spherical Gaussian surface of 8.0 cm radius, centred on the charge. The value of the point charge is :
(Given \(\epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}\) )JEE Mains 2025 Easy - Figure shows a current carrying square loop ABCD of edge length is ' \(a\) ' lying in a plane. If the resistance of the \(A B C\) part is \(r\) and that of \(A D C\) part is 2 r , then the magnitude of the resultant magnetic field at centre of the square loop is
JEE Mains 2025 Hard - A transverse wave is represented by \(y = \frac{{10}}{\pi }\,\sin \,\left( {\frac{{2\pi }}{T}t - \frac{{2\pi }}{\lambda }x} \right)\) For what value of the wavelength the wave velocity is twice the maximum particle velocity ..... \(cm\) ?JEE Mains 2014 Medium
More PYQs from JEE Mains
- If the domain of the function \( f(x)=\cos^{-1}(\frac{2x-5}{11-3x})+\sin^{-1}(2x^{2}-3x+1) \) is the interval \( [\alpha,\beta] \), then \( \alpha+2\beta \) is equal to:JEE Mains 2026 Easy
- A satellite is launched into a circular orbit of radius \(‘R’\) around earth while a second satellite is launched into an orbit of radius \(1.02 R\). The percentage difference in the time periods of the two satellites is ......... \(\%\)JEE Mains 2021 Medium
- An \(LCR\) circuit contains resistance of \(110 \, \Omega\) and a supply of \(220\, V\) at \(300 \,rad / s\) angular frequency. If only capacitance is removed from the circuit, current lags behind the voltage by \(45^{\circ}\). If on the other hand, only inductor is removed the current leads by \(45^{\circ}\) with the applied voltage. The rms current flowing in the circuit will be ...... \(A\)JEE Mains 2021 Hard
- Blocks of masses \(m , 2 m , 4 m\) and \(8 m\) are arranged in a line on a frictionless floor. Another block of mass \(m ,\) moving with speed \(v\) along the same line (see figure) ollides with mass \(m\) in perfectly inelastic manner. All the subsequent collisions are also perfectly inelastic. By the time the last block of mass \(8 m\) starts moving the total energy loss is \(p \%\) of the original energy. Value of \('p'\) is close to
JEE Mains 2020 Hard - The relation \(R =\{( a , b ): \operatorname{gcd}( a , b )=1,2 a \neq b , a , b \in Z \}\) is:JEE Mains 2023 Hard
- For using a multimeter to identify diode from electrical components. choose the correct statement out of the following about the diodeJEE Mains 2022 Medium