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#1 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
When exposed to sunlight, thin films of oil on water exhibit brilliant colours due to the phenomenon of
A. interference
B. diffraction
C. dispersion
D. polarisation
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#2 Class 12 Physics Wave Optics 2011 Mcq 1M CBSE
Bright colours exhibited by a spider's web exposed to sunlight are due to
A. diffraction
B. polarisation
C. interference
D. resolution
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#3 Class 12 Physics Wave Optics 2018 Mcq 1M CBSE
In Huygens' wave theory, the locus of all points oscillating in the same phase is called a
A. ray
B. vibrator
C. wavefront
D. half period zone
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#4 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
The inverse square law of intensity (illuminance) is valid for
A. plane wavefront
B. conical wavefront
C. spherical wavefront
D. cylindrical wavefront
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#5 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
Huygens' wave theory of light cannot explain
A. diffraction
B. interference
C. polarisation
D. photoelectric effect
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#6 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
The colour of a thin film is due to
A. scattering
B. interference
C. dispersion
D. diffraction
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#7 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
In a Young's double-slit experiment in air, the fringe width is found to be 0.44 mm. If the entire setup is immersed in water ($n = 4/3$), the fringe width will be
A. 0.88 mm
B. 0.59 mm
C. 0.33 mm
D. 0.44 mm
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#8 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
What is the new focal length of a convex lens when it is cut (a) vertically and (b) horizontally?
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#9 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 3M CBSE
A ray of light is incident on an equilateral glass prism at angle $i = \frac{3}{4} \times A$ (where $A$ is the angle of prism). If the ray passes symmetrically through the prism, find: (a) angle of minimum deviation, ...
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#10 Class 12 Physics Ray Optics and Optical Instruments 2023 Long 4M CBSE
Read the passage about types of lenses and answer: (i) Two thin lenses in coaxial contact have combined focal length 80 cm. If focal length of one lens is 20 cm, the focal length of the other is (ii) A spherical air b...
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#11 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 2M CBSE
In an astronomical telescope in normal adjustment, a straight black line of length $L$ is drawn on the objective lens. The eyepiece forms a real image of this line of length $l$. What is the angular magnification of t...
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#12 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 2M CBSE
Show that the least possible distance between an object and its real image in a convex lens is $4f$, where $f$ is the focal length.
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#13 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M CBSE
A compound microscope has objective focal length 2.0 cm and eyepiece focal length 6.25 cm, separated by 15 cm. How far from objective should object be placed for final image at (a) $D = 25$ cm and (b) infinity? Find m...
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#14 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE
(i) A giant refracting telescope has objective focal length 15 m and eyepiece focal length 1.0 cm. Find the angular magnification in normal adjustment. (ii) If used to view the moon (diameter $3.48 \times 10^6$ m, orb...
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#15 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 3M CBSE
A ray PQ is incident normally on face AB of a triangular prism of refracting angle 60°, made of a material of refractive index $\frac{2}{\sqrt{3}}$. Calculate the angle of emergence and angle of deviation.
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#16 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M CBSE
A Cassegrain telescope has two mirrors placed 20 mm apart. The radius of curvature of the large mirror is 200 mm and of the small mirror is 150 mm. Where will the final image of an object at infinity be formed?
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#17 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE
(A) Define angle of deviation in a prism. (B) Obtain the relation $A + \delta = i + e$ for a prism where $A$ is the angle of prism, $\delta$ is the angle of deviation, $i$ is the angle of incidence and $e$ is the angl...
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#18 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M CBSE
Equi-convex lenses are to be manufactured from glass of refractive index 1.55, with both faces of the same radius of curvature. What radius of curvature is required if the focal length is to be 10 cm?
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#19 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE
A compound microscope has objective focal length 0.82 cm and eyepiece focal length 2.9 cm. Object is placed 0.91 cm from objective. Image is formed at near point (25 cm). Calculate the angular magnification of the mic...
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#20 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 5M CBSE
Explain with a neat diagram the working of a compound microscope. Obtain an expression for its magnifying power.
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