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#1 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M

A ray of light is incident at the glass-water interface at angle $i$. It finally emerges parallel to the surface of water (i.e., at 90° to the normal). Find the refractive index of glass $\mu_g$ if the refractive inde...

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

The refractive indices of water and glass are 1.2 and 1.5 respectively. What is the refractive index of glass with respect to water?

A. 1.75

B. 1.25

C. 0.8

D. 0.6

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#3 Class 12 Physics Ray Optics and Optical Instruments 2021 Mcq 1M

If a ray of light is incident on a plane mirror at an angle of 30°, the deviation produced by the plane mirror is

A. 30°

B. 60°

C. 90°

D. 120°

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

A plane mirror produces a magnification of

A. 0

B. $-1$

C. $+1$

D. between 0 and $+1$

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

The critical angle of light passing from glass to air is minimum for

A. red colour

B. yellow colour

C. green colour

D. violet colour

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

The radius of curvature of a plane mirror is

A. infinite

B. zero

C. $+5$ cm

D. $-5$ cm

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#7 Class 12 Physics Ray Optics and Optical Instruments 2019 Short 1M

A path length $t$ in a glass plate of refractive index $n$ is equivalent to what path length in vacuum?

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

The magnifying power of a magnifying glass of power 12 dioptre is (Take $D = 25$ cm)

A. 4

B. 1200

C. 3

D. 4

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

If a glass rod is immersed in a liquid of the same refractive index, then it will

A. disappear

B. look bent

C. look longer

D. look shorter

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

When two identical converging lenses, each of focal length $f$, are placed in contact, the focal length of the combination is

A. $f$

B. $2f$

C. $f/2$

D. $f/3$

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

When the tube length of a microscope is increased, its magnifying power

A. increases

B. decreases

C. becomes zero

D. remains unchanged

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

When a ray of light enters a glass slab, its wavelength

A. decreases

B. increases

C. remains unchanged

D. data not complete

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

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

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

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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#16 Class 12 Physics Electromagnetic Waves 2023 Short 3M

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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#17 Class 12 Physics Electromagnetic Waves 2022 Short 2M

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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#18 Class 12 Physics Electromagnetic Waves 2023 Short 3M

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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#19 Class 12 Physics Electromagnetic Waves 2022 Short 2M

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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#20 Class 12 Physics Electromagnetic Waves 2021 Mcq 1M

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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