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

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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#2 Class 12 Physics Ray Optics and Optical Instruments 2023 Long 4M

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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#3 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 2M

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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#4 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 2M

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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#5 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M

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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#6 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M

(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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#7 Class 12 Physics Ray Optics and Optical Instruments 2021 Short 3M

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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#8 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M

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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#9 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M

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

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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#11 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M

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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#12 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 5M

Explain with a neat diagram the working of a compound microscope. Obtain an expression for its magnifying power.

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#13 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M

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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#14 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M

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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#15 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M

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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#16 Class 12 Physics Ray Optics and Optical Instruments 2022 Long 5M

(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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#17 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 5M

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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#18 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 2M

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

When observed from under water, all objects above the surface can be seen within a cone of 97°. Why? Explain.

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#20 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M

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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