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#1 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 1M CBSE
Assertion (A): Refractive index of diamond is $\sqrt{6}$ and of a liquid is $\sqrt{3}$. If light travels from diamond to the liquid, it will be totally internally reflected when angle of incidence is 30°. Reason (R): ...
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#2 Class 12 Physics Ray Optics and Optical Instruments 2023 Long 1M CBSE
Assertion (A): Propagation of light through an optical fibre is due to total internal reflection at the core-cladding interface. Reason (R): Refractive index of the cladding is greater than that of the core.
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#3 Class 12 Physics Ray Optics and Optical Instruments 2021 Mcq 1M CBSE
A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is
A. 2 cm
B. 4 cm
C. 6 cm
D. 12 cm
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#4 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 1M CBSE
Assertion (A): The critical angle of light passing from glass to air is minimum for violet colour. Reason (R): The wavelength of violet light is smaller than that of other colours.
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#5 Class 12 Physics Ray Optics and Optical Instruments 2021 Mcq 1M CBSE
A glass prism has angles 45°, 45°, 90°. The critical angle of glass is 45°. Which ray diagram depicts the correct path of light through the prism?
A. Light undergoes TIR at the hypotenuse face
B. Light passes straight through
C. Light refracts out at the hypotenuse
D. Light undergoes TIR at both legs
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#6 Class 12 Physics Ray Optics and Optical Instruments 2022 Mcq 1M CBSE
If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is
A. $3 \times 10^8$ m/s
B. $1.5 \times 10^8$ m/s
C. $6 \times 10^8$ m/s
D. $\sqrt{3} \times 10^8$ m/s
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#7 Class 12 Physics Ray Optics and Optical Instruments 2021 Mcq 1M CBSE
A sound wave travels from air to water. The angle of incidence is $\alpha_1$ and the angle of refraction is $\alpha_2$. If Snell's law is valid then
A. $\alpha_1 \geq \alpha_2$
B. $\alpha_1 = \alpha_2$
C. $\alpha_1 > \alpha_2$
D. $\alpha_1 < \alpha_2$
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#8 Class 12 Physics Ray Optics and Optical Instruments 2020 Mcq 1M CBSE
The velocity of light in a medium is $2 \times 10^8$ m/s. The refractive index of the medium is
A. 1
B. 1.1
C. 1.4
D. 1.5
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#9 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M CBSE
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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#10 Class 12 Physics Ray Optics and Optical Instruments 2020 Mcq 1M CBSE
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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#11 Class 12 Physics Ray Optics and Optical Instruments 2021 Mcq 1M CBSE
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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#12 Class 12 Physics Ray Optics and Optical Instruments 2019 Mcq 1M CBSE
A plane mirror produces a magnification of
A. 0
B. $-1$
C. $+1$
D. between 0 and $+1$
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#13 Class 12 Physics Ray Optics and Optical Instruments 2020 Mcq 1M CBSE
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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#14 Class 12 Physics Ray Optics and Optical Instruments 2018 Mcq 1M CBSE
The radius of curvature of a plane mirror is
A. infinite
B. zero
C. $+5$ cm
D. $-5$ cm
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#15 Class 12 Physics Ray Optics and Optical Instruments 2019 Short 1M CBSE
A path length $t$ in a glass plate of refractive index $n$ is equivalent to what path length in vacuum?
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#16 Class 12 Physics Ray Optics and Optical Instruments 2020 Mcq 1M CBSE
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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#17 Class 12 Physics Ray Optics and Optical Instruments 2018 Mcq 1M CBSE
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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#18 Class 12 Physics Ray Optics and Optical Instruments 2019 Mcq 1M CBSE
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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#19 Class 12 Physics Ray Optics and Optical Instruments 2020 Mcq 1M CBSE
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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#20 Class 12 Physics Ray Optics and Optical Instruments 2019 Mcq 1M CBSE
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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