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#1 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 2M CBSE
Two convex lenses of same focal length but apertures $A_1$ and $A_2$ ($A_2 < A_1$) are used as objective lenses in two astronomical telescopes with identical eyepieces. What is the ratio of their resolving powers? ...
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#2 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M CBSE
When observed from under water, all objects above the surface can be seen within a cone of 97°. Why? Explain.
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#3 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
A convex lens of focal length $f_1$ is kept in contact with a concave lens of focal length $f_2$. Find the focal length of the combination.
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#4 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 5M CBSE
(i) A mobile phone lies along the principal axis of a concave mirror. Show with a diagram the formation of its image. Explain why magnification is not uniform. (ii) Suppose the lower half of the concave mirror's refle...
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#5 Class 12 Physics Ray Optics and Optical Instruments 2019 Short 2M CBSE
What is the difference between magnification and magnifying power?
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#6 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M CBSE
When light travels from an optically denser medium to a rarer medium, why does the critical angle of incidence depend on the colour of light?
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#7 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
What is the cause of dispersion of light?
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#8 Class 12 Physics Ray Optics and Optical Instruments 2014 Short 2M CBSE
A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens?
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#9 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M CBSE
Why does a convex lens of glass ($\mu = 1.5$) behave as a diverging lens when immersed in carbon disulphide ($\mu = 1.65$)?
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#10 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the lens?
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#11 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 2M CBSE
(i) What is the relation between critical angle and refractive index of a material? (ii) Does critical angle depend on the colour of light?
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#12 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
State the two criteria for the phenomenon of total internal reflection of light.
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#13 Class 12 Physics Ray Optics and Optical Instruments 2019 Short 2M CBSE
How does the focal length of a lens change when red light incident on it is replaced by violet light? Give reason.
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#14 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
For the same angle of incidence, the angle of refraction in media A and B are 25° and 35° respectively. In which medium is the speed of light lesser?
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#15 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 3M CBSE
The radius of curvature of a convex mirror is 30 cm. It forms an image of an object which is half the size of the object. Find the separation between the object and the image.
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#16 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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#17 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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#18 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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#19 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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#20 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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