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#1 Class 12 Physics Ray Optics and Optical Instruments 2018 Mcq 1M CBSE

The final image in an astronomical telescope is

A. real and erect

B. real and inverted

C. virtual and inverted

D. virtual and erect

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#2 Class 12 Physics Ray Optics and Optical Instruments 2020 Mcq 1M CBSE

The focal length of a lens of refractive index $\mu = 1.5$ in air is 20 cm. What will be its focal length when placed in a medium of refractive index 1.5?

A. 20 cm

B. 40 cm

C. 10 cm

D. $\infty$ (infinite)

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#3 Class 12 Physics Ray Optics and Optical Instruments 2019 Mcq 1M CBSE

The angle of minimum deviation for a thin prism of refractive index $\mu$ is

A. $(1-\mu)A$

B. $(\mu-1)A$

C. $(\mu+1)A$

D. $(\mu+1)A^2$

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#4 Class 12 Physics Electromagnetic Waves 2023 Short 3M CBSE

Light with an energy flux of $25 \times 10^4$ W/m$^2$ falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm$^2$, find the average force exerted on the surface.

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#5 Class 12 Physics Electromagnetic Waves 2022 Short 2M CBSE

A red LED emits light at 0.1 W uniformly around it. Find the amplitude of the electric field of the light at a distance of 1 m from the diode.

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#6 Class 12 Physics Electromagnetic Waves 2023 Short 3M CBSE

The magnetic field in a plane electromagnetic wave is given by $B = (200\ \mu\text{T})\sin[(4.0 \times 10^{15}\text{ s}^{-1})(t - x/c)]$. Find: (a) the maximum electric field, (b) the average energy density of the ele...

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#7 Class 12 Physics Electromagnetic Waves 2022 Short 2M CBSE

In an electromagnetic wave in free space, the rms value of the electric field is $E_{rms} = 6$ V/m. Find the peak value of the magnetic field.

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#8 Class 12 Physics Electromagnetic Waves 2021 Mcq 1M CBSE

The electric field of an EM wave in a medium is: $E_x = 0$, $E_y = 2.5\cos[(2\pi \times 10^6)t - (\pi \times 10^{-2})x]$ N/C, $E_z = 0$. The wave is

A. Moving along $y$-direction with frequency $2\pi \times 10^6$ Hz and wavelength 200 m

B. Moving along $x$-direction with frequency $10^6$ Hz and wavelength 100 m

C. Moving along $x$-direction with frequency $10^6$ Hz and wavelength 200 m

D. Moving along $-x$ direction with frequency $10^6$ Hz and wavelength 200 m

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#9 Class 12 Physics Electromagnetic Waves 2022 Short 3M CBSE

A 100 $\Omega$ resistance and a capacitor of 100 $\Omega$ reactance are connected in series across a 220 V source. When the capacitor is 50% charged, find the peak value of the displacement current.

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#10 Class 12 Physics Electromagnetic Waves 2019 Short 2M CBSE

A capacitor has been charged by a DC source. What are the magnitudes of conduction current and displacement current when it is fully charged?

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#11 Class 12 Physics Electromagnetic Waves 2020 Short 2M CBSE

The voltage between the plates of a parallel-plate capacitor of capacitance 1 $\mu$F is changing at the rate of 5 V/s. What is the displacement current in the capacitor?

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#12 Class 12 Physics Electromagnetic Waves 2021 Mcq 1M CBSE

Which electromagnetic waves are known as 'heat waves'?

A. UV rays

B. IR rays

C. X-rays

D. Gamma rays

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#13 Class 12 Physics Electromagnetic Waves 2020 Mcq 1M CBSE

Welders wear special glass goggles or face masks to protect their eyes from

A. UV rays

B. X-rays

C. IR rays

D. Gamma rays

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#14 Class 12 Physics Electromagnetic Waves 2021 Short 3M CBSE

Electromagnetic waves with wavelengths (i) $\lambda_1$ used in radar for aircraft navigation, (ii) $\lambda_2$ used to kill germs in water purifiers, (iii) $\lambda_3$ used to improve visibility in fog and mist. Ident...

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#15 Class 12 Physics Electromagnetic Waves 2022 Short 3M CBSE

The amplitude of the magnetic field of a plane electromagnetic wave propagating along the positive x-axis in vacuum is $B_0 = 510$ nT and its angular frequency is $\omega = 6.0 \times 10^7$ rad/s. Write the expression...

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#16 Class 12 Physics Electromagnetic Waves 2023 Short 3M CBSE

A capacitor made of two parallel plates each of area $A$ and separation $d$ is being charged by an external AC source. Show that the displacement current inside the capacitor is the same as the current charging the ca...

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#17 Class 12 Physics Electromagnetic Waves 2021 Short 2M CBSE

What is displacement current? Why was this concept introduced by Maxwell?

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#18 Class 12 Physics Electromagnetic Waves 2022 Short 3M CBSE

State Maxwell's four equations (Maxwell's equations).

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#19 Class 12 Physics Electromagnetic Waves 2023 Long 5M CBSE

How are electromagnetic waves produced? What is the source of energy of these waves? Write mathematical expressions for $\vec{E}$ and $\vec{B}$ of an EM wave propagating along the z-axis. Write any two important prope...

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#20 Class 12 Physics Electromagnetic Waves 2022 Short 2M CBSE

Write an expression for the momentum carried by an electromagnetic wave. How do you establish that EM waves carry energy and momentum?

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