Recent questions tagged ray-optics-and-optical-instruments

What should be the value of angle $\theta$ so that light entering normally through the surface AC of a prism of refractive index $(n= \large\frac{3}{2})$ does not cross the second refracting surface AB.

asked Feb 12, 2014 by meena.p

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Find angle of refraction in a medium $(\mu =2)$ . If light is incident in vacuum making angle equal to twice the critical angle.

asked Feb 12, 2014 by meena.p

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Find maximum angle that can be made in glass medium $(\mu =1.5)$ if a light ray is refracted from glass to vacuum.

asked Feb 11, 2014 by meena.p

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Find lateral shift of light ray while is passes through a parallel glass slab of thickness 10 cm placed in air.The angle of incidence in air is $60^{\circ}$ and angle of refraction in glass is $45^{\circ}$

asked Feb 11, 2014 by meena.p

1 answer

A layer of oil 3 cm thick is floating on a layer of colored water 5 cm thick refractive index of colored water is $\large\frac{5}{3}$ and apparent depth of two liquids appears to be $\large\frac{36}{7}$cm. Then refractive index of oil:

asked Feb 11, 2014 by meena.p

1 answer

A fish in an aquarium approaches the left wall at a rate of $2.5 \;m/s$ observes a fly approaching it at $8 m/s$ If the refractive index of water is $(4/3)$ . Then the actual velocity of fly is

asked Feb 11, 2014 by meena.p

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Refractive index of glass with respect to water is $1.125$ . If the absolute refractive index of glass is $1.5 $ find the absolute refractive index of water.

asked Feb 11, 2014 by meena.p

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A ray of light is incident on a transparent glass slab of refractive index $1.62$ . If the reflected and refracted rays are mutually perpendiculars, what is angle of incidence?

asked Feb 11, 2014 by meena.p

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Light is incident formals on as oil at an incident angle of $30^{\circ}$ After moving through the oil -1, oil-2, and glass it exters water . If the refraction index of glass and water are 1.5 and 1.3 respectively . Then the angle which the ray makes with normal in water .

asked Feb 11, 2014 by meena.p

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Find speed of light in medium 'a' if speed of light in medium 'b' is $\large\frac{c}{3}$ where $c=$ Speed of light in vaccum and light refracts from medium 'a' to medium 'b' making $45^{\circ}$ and $60^{\circ}$ respective with normal.

asked Feb 11, 2014 by meena.p

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Find angle $\theta_a$ made by light ray when it gets refracted from water to air as shown .

asked Feb 11, 2014 by meena.p

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A light ray is incident on a glass sphere at angle of incidence $60^{\circ}$ as shown. then the total deviation after two refraction is :

asked Feb 11, 2014 by meena.p

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A person looks in to a spherical mirror . The size of image of his face is twice the actual size of his face. If the face is at distance 20 cm then find the radius of curvature of mirror.

asked Feb 11, 2014 by meena.p

2 answers

An extended objected is placed perpendicular to principal axis of a concave mirror of radius of curvature 20 cm at a distance of 15 cm from pole. Find the lateral magnification produced

asked Feb 11, 2014 by meena.p

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If a luminous point is moving at a speed $V_0$ towards spherical mirror of focal length f along its axis, Find the speed of image.

asked Feb 11, 2014 by meena.p

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A thin rod of length $\large\frac{f}{3}$ is placed along optical axis a concave mirror of focal length f such that its image which is real and elongated just touches rod . calculate the magnification.

asked Feb 11, 2014 by meena.p

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An object of length $2.5\;cm$ is placed at a $1.5\; f$ from a concave mirror where f is magnitude of focal length of mirror. The length of object is perpendicular to principal axis . Then which of following will be correct . (i) image is 5 cm long (ii) image is 10 cm long (iii) image is inverted (iv)image is erect

asked Feb 11, 2014 by meena.p

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The velocity of image will be :

asked Feb 11, 2014 by meena.p

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Where should an object be placed in from of a concave mirror of focal length 30 cm so that the image size is 5 times the object size?

asked Feb 11, 2014 by meena.p

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An object moves with 5 m/s towards right while mirror moves with 1 m/s towards the left as shown. Find velocity of image.

asked Feb 11, 2014 by meena.p

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Two plane mirrors are inclined to each other such that a ray of light incident on first mirror and parallel to second is reflected from second mirror parallel to first mirror. Find angle between two mirrors.

asked Feb 11, 2014 by meena.p

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There is a point object and a plane mirror . If the mirror is moved by 10 cm away from object , find distance which the image will move by

asked Feb 10, 2014 by meena.p

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A Point source of light B is placed at a distance L in front of centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to mirror at a distance 2L from it as shown. Find greatest distance over which he can see the image of light source in mirror.

asked Feb 10, 2014 by meena.p

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Minimum size of plane mirror, required to see full image of an observer is :

asked Feb 10, 2014 by meena.p

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Find region on Y axis in which reflected rays are present object is at A(2,0) and MN is a plane mirror as shown:

asked Feb 10, 2014 by meena.p

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The image of object A in mirror MN will be

asked Feb 10, 2014 by meena.p

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Equi convex lens is placed such that optic axis coincides with the x-axis, position of object is $(-40 \;cm, 1 \;cm) $ and position of image $(50 \;cm, -2\;cm) $ where is the lens located

asked Jan 24, 2014 by meena.p

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A ray of light is incident on a prism of refractive index $\mu =\sqrt 2$ It is found that the deviation caused is $30^{\circ}$ The angle of prism is $60^{\circ}$ What will be the angle between the ray inside the prism and the base of the prism .

asked Jan 24, 2014 by meena.p

1 answer

A prism of refractive index $\mu =1.5 $ of vertical angle $6 ^{\circ}$ is placed in front of a mirror. A ray of light is incident normally on one of the face of the prism as shown. What is the total deviation caused by the system.

asked Jan 24, 2014 by meena.p

1 answer

A ray of light passes through four transparent media with refractive indices $\mu_1, \mu_2, \mu_3$ and $\mu_4$ as shown. The surface of all media are parallel. The emerging say CD is parallel to incident ray AB, Then ,

asked Jan 24, 2014 by meena.p

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The maximum distance a person having defect of short right can see clearly is 4 meters. The power of lens required to correct is

asked Jan 23, 2014 by meena.p

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A double convex lens $(\mu =1.5) $ has its focal length 10 cm. What will be its focal length if it is immersed in liquid of $(\mu_1=\large\frac{4}{3})$

asked Jan 23, 2014 by meena.p

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The objective of a telescope has a diameter 5 cm. What is the angular seperation in radius of two starts which can be resolved by the telescope when light of $3000 A^{\circ}$ is used.

asked Jan 23, 2014 by meena.p

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The magnifying power of telescope is 9. when it is adjusted for parallel rays, the distance between objective and eye piece is found to be 20 cm. The focal length of lenses are

asked Jan 23, 2014 by meena.p

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Light is incident at $30^{\circ}$ on one side of a right angled isosceles prism of $\mu =\large\frac{3}{2}$. What will be the angle of emergence.

asked Jan 23, 2014 by meena.p

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A vessel of height h is half filled with one liquid of refractive index $\mu_1 $ and upper half filled with another liquid of refractive index $\mu_2$ The apparent depth of the vessel is

asked Jan 22, 2014 by meena.p

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A coin lies at the bottom of a tank filled with two immissible liquid. Liquid 1 on top is $20\;cm$ layer thick of refractive index $\mu_1 =1.33$ and liquid 2 is $40\;cm$ thick with refractive index $\mu_2=1.46$. At what depth below the surface the coin appear?

asked Jan 22, 2014 by meena.p

1 answer

A point object is placed in front of a thin lens of focal length $f= 0.50\;m$ at a distance of $1.0\;m$ . A flat mirror is placed 2 m behind the lens. What is the distance between the lens and the final image formed.

asked Jan 22, 2014 by meena.p

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Two thin lenses of focal lengths $f_1$ and $f_2$are in contact , the equivalent focal length is

asked Jan 22, 2014 by meena.p

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A parallel beam of light is incident on a solid transparent sphere of refractive inbox $\mu$. If a point image is formed on the back of the sphere , the refractive index of sphere is

asked Jan 22, 2014 by meena.p

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The equiconvex lens of glass of $\mu =1.5$ and focal length $15\;cm$ is silvered on one side. It will behave like.

asked Jan 22, 2014 by meena.p

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Magnification produced by astronomical telescope for normal adjustment is 20 and length of telescope is $1.05\;m$ The magnification when image is formed at least distance of district vision $(D= 25 cm)$ is

asked Jan 22, 2014 by meena.p

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A microscope has objective of focal $1.5\; cm$ and eye piece of focal length $2.5 \;cm$. If length of tube $25\;cm$ What must be the magnification produced.

asked Jan 22, 2014 by meena.p

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A system consists of a convex lens and a concave mirror placed at a distance of x from the lens. Focal length $f_1$ of convex lens in 10 cm and focal length $f_2$ of mirror is 60 cm. If an object is placed at a distance 20 cm from the lens and it is found that the final image coincides with the object position, then what must be the distance 'x'

asked Jan 22, 2014 by meena.p

1 answer

An object is kept at a distance of 12 cm from a thin lens and image formed is real. If the object is kept at a distance of $8\;cm$ from the same lens image formed is virtual. If the size of image formed is equal length of lens will be :

asked Jan 22, 2014 by meena.p

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Two rays of light travel as shown.The refractive index of material is 3/2 and that of the surrounding is 4/3. What is the path difference between the two.

asked Jan 22, 2014 by meena.p

1 answer

A system of lenses is formed by fitting a plans convex lens, whose radius of curvature is R and $\mu_1$,the refractive index of plano convex lens is $\large\frac{3}{2} $ and $\mu_2$ the refractive index of Plano concave lens is $\large\frac{4}{3}$. Then the focal length of combination is

asked Jan 22, 2014 by meena.p

1 answer

A system of lens consists of two convex lenses of focal length $f_1= 30\;cm$ and $f_2 =20\;cm$. Separated by a distance 'd'. When a parallel beam of light is incident on the first lens after two refraction the resultant rays come out parallel then the distance 'd' is

asked Jan 22, 2014 by meena.p

1 answer

A convex lens of focal length 20 cm is placed glass slab of refractive index $\large\frac{3}{2}$.A parallel beam of light is incident on the convex lens. The light will converge.

asked Jan 22, 2014 by meena.p

1 answer

A man can view through telescope two district objects at a distance of $120 \;m$ from him if he uses light of $ \lambda= 550 A^{\circ}$ What must be minimum separation between objects if diameter of his pupil $D= 2.5 \;mm$

asked Jan 21, 2014 by meena.p

1 answer

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