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#1 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M CBSE
Derive the lens maker's formula: $\frac{1}{f} = (\mu - 1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$
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#2 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE
An object is at infinity from a plano-convex lens whose plane surface is silvered. Explain the image formation and find the focal length of the equivalent mirror.
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#3 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M CBSE
Draw a ray diagram to show the refraction of light through a glass prism. Derive the formula for the refractive index of the material of the prism in terms of angle of prism $A$ and angle of minimum deviation $\delta_m$.
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#4 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 5M CBSE
(a) Draw a labelled ray diagram of a reflecting (Cassegrain) telescope. (b) Why does the objective have a larger focal length and larger aperture? (c) State the advantages of a reflecting telescope over a refracting t...
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#5 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M CBSE
With the help of a suitable ray diagram, derive the relation between object distance $u$, image distance $v$ and radius of curvature $R$ for refraction at a convex spherical surface when a ray of light travels from a ...
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#6 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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#7 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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#8 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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#9 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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#10 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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#11 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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#12 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M CBSE
What is the cause of dispersion of light?
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#13 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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#14 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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#15 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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#16 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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#17 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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#18 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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#19 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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#20 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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