Recent questions tagged unit16

Refractive index for a piece of transparent material is greatest for

asked Jan 16, 2014 by meena.p

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An object is placed in front of a concave mirror of focal length f. A virtual image of magnification 2 is formed.How for must the object be moved from original position so that a real image of same size is formed.

asked Jan 16, 2014 by meena.p

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A right angled prism ABC is dipped in water . such that the surface AB is in air as shown. A ray of light is normally. What must be the possible value of $\theta$ so that the say gets totally reflected at AC to reach surface BC.

asked Jan 16, 2014 by meena.p

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A ray of light is incident on side of a right angled prism normally. It then falls on the hypotenuse of the prism and gets reflected back as shown. If $\theta=45^{\circ}$ then the refractive index of the material of prism is

asked Jan 16, 2014 by meena.p

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A ray of light travelling in glass enters glass water interface at an angle $\theta$. It finally emerges into air parallel to the surface of water. $ \mu_w=\large\frac{4}{3}$. What is the refractive index of glass.

asked Jan 16, 2014 by meena.p

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A combination of lens is formed by keeping two identical equiconvex lens of focal length f kept in contact and the space between them filled with liquid of refractive index $\mu_2 =\large\frac{4}{3}$. Focal length of the combination is

asked Jan 16, 2014 by meena.p

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A ray of light is incident on glass sphere of refractive index $\large\frac{3}{2}$. The ray incident at two surfaces after travelling through the sphere emerges tangential to the surface of the sphere. What must be the incident angle.

asked Jan 16, 2014 by meena.p

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A small point object is inside a glass surface as shown. Refraction takes place at concave spherical boundry separating glass air medium. For the image to be real the object distance u is (R-Radius of curvature of the surface , $\mu of glass =\large\frac{3}{2}$ )

asked Jan 16, 2014 by meena.p

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Position of object (u) reflected from concave varies from $0$ to $\infty$ which of the graph represents the variation of object distance (v) with respect to (u)

asked Jan 16, 2014 by meena.p

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A glass slab of refractive index $1.5$ and thickness $3\;cm$ is placed on a black dot on a piece of paper. A person looks at the mark from a height of $8\; cm $ above it. The dot will appear at a distance.

asked Jan 16, 2014 by meena.p

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A ray of light is incident from air on a surface of medium at an angle of $60^{\circ}$. The angle of refraction in the medium is $ 30^{\circ}$ what will be the velocity of light in the medium.

asked Jan 16, 2014 by meena.p

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A ray of light is incident on a rectangular glass block at $45^{\circ}$ on glass- air interface. The refractive index of glass is $\sqrt 2$. Then

asked Jan 16, 2014 by meena.p

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light travels through a glass of refractive index $\mu =1.5 $ of thickness $4 mm$. What is the time taken for the light to cross it

asked Jan 16, 2014 by meena.p

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A light wave has wavelength $6000 \mathring{A}$ in vacuum. The wavelength of this light when it passes through a certain glass of refraction index $(\mu =1.5 ) $ is

asked Jan 16, 2014 by meena.p

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Wavelength of a colour of light for air is $6000\;\mathring{A}$ and in water the wavelength is $4500\;\mathring{A}$. What is the speed of light in water.

asked Jan 16, 2014 by meena.p

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Image formed by a concave mirror of is three times of the object Focal length of the mirror is 6 cm. Then the object distance is

asked Jan 16, 2014 by meena.p

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An object of length 3 cm is placed on the principle axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be :

asked Jan 16, 2014 by meena.p

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A concave mirror of focal length f(in air) is immerssed in water $(\mu =\large\frac{4}{3} ) $. The focal length of mirror in water will be

asked Jan 15, 2014 by meena.p

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Which one of the following statement is true.

asked Jan 15, 2014 by meena.p

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Two plane mirrors are inclined to each other at some angle. A ray of light incident at $30^{\circ}$ on one mirror after reflection from the other mirror retracts its path. The angle between the mirror is :

asked Jan 15, 2014 by meena.p

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A ray of light is reflected by two plane mirror mutually at right angles to each other. What is the deviation of reflected ray from the incident ray

asked Jan 15, 2014 by meena.p

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A ray of light is incident at an angle of $20^{\circ}$ to the normal. What is the deviation caused due to reflection?

asked Jan 15, 2014 by meena.p

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A man is walking towards the plane mirror at the speed of $4 km/hr$ . What is the speed with which he is approaching his image?

asked Jan 15, 2014 by meena.p

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Two plane mirrors are inclined to each other in such a way that a ray of light moving parallel to one mirror comes out parallel to the other mirror after two reflections. The angle between the mirrors is :

asked Jan 15, 2014 by meena.p

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A ray of light is incident at $30^{\circ} $ on the plane mirror. What is the angle between mirror and reflected ray ?

asked Jan 15, 2014 by meena.p

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