STANDARD Physics Ray Optics Class 12 Questions

The number of images formed by the lens, if an object is placed on the axis of the lens is:

Which is the correct form of the graph of angle of incidence vs angle of deviation for a triangular prism during the parallax method?

Match the corresponding entries of column 1 with column 2 where m is the magnification produced by the mirror.

The refractive index of the material of a prism is √2 and the angle of the prism is 30°. One of the two refracting surface of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is?

An equiconvex lens is cut into two halves a long (i) XOX and (ii) YOY as shown in the figure let f, f', f'' be the focal lengths of the complete lens of each half in case (i) and of each half in case (ii) respectively. Choose the correct statement from the following:

The refracting angle of a prism is A, and refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is:

A boy of height 1 m stands in front of a convex mirror. His distance from the mirror is equal to its focal length. The height of his image is

An air bubble in a glass with refractive index 1.5 (near normal incidence) i.e. 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the is.

A concave shaving mirror has a radius of curvature of 35.0 cm. It is positioned so that the (upright) image of a man's face is 2.50 times the size of the face. How far is the mirror from the face?

A rod of length 10 cm lies along the principal axis a concave mirror of focal length 10 cm in such a way that its end close to the pole is 20 cm away from the mirror. The length of the image is

An object 2 cm high is placed at a distance of 16 cm from a concave mirror, which produces a real image 3 cm high. What is the focal length of the mirror?

When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10 cm. If the object is moved with a speed of 9 m s⁻¹, the speed with which image moves is

Refraction of light from air to glass and from air to water are shown in figure (i) and (ii) given below. The value of the angle θ in the case of refraction as shown in figure (iii) will be

A vessel of depth x is half filled with oil of refractive index μ₁ and the other half is filled with water of refractive index μ₂. The apparent depth of the vessel when viewed from above is

Unpolarised light of intensity 32 W m⁻¹ passes through three polarizers such that transmission axis of first is crossed with third. If intensity of emerging light is 2 W m⁻², what is the angle of transmission axis between the first two polarizers?

Unpolarized light is incident on a plane glass surface. The angle of incidence so that reflected and refracted rays are perpendicular to each other is given by

The refractive index of a medium is √3. If a beam of unpolarized light is incident on it at the polarizing angle of the medium, the angle of refraction is

The velocity of light in air is 3 × 10⁸ m s⁻¹ and that in water is 2.2 × 10⁸ m s⁻¹. The polarising angle of incidence is

When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarized. The velocity of light in glass is

The critical angle of a certain medium is sin⁻¹(3/5). The polarizing angle of the medium is

If there are N atoms in a source of Laser light and each atom is emitting light with intensity I, then the total intensity produced by it is

Light is incident on a glass surface at polarizing angle of 57.5°. Then the angle between the incident ray and the refracted ray is

The acronym LASER stands for

The Brewsters angle iₑ for an interface should be

The interference pattern n is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio \( \frac{I_{max} - I_{min}}{I_{max} + I_{min}} \) will be:

Three immiscible liquids of densities d₁ > d₂ > d₃ and refractive indices μ₁ > μ₂ > μ₃ are put in a beaker. The height of each liquid column is h/3. A dot is made at the bottom of the beaker. For near normal vision, the apparent depth of the dot is

For a total internal reflection, which of the following is correct?

Critical angle of glass is θ₁ and that of water is θ₂. The critical angle for water and glass surface would be (μg = 3/2, μw = 4/3)

Critical angle for light going from medium (A) to (B) is θ. The speed of light in medium (A) is v, then the speed of light in medium (B) is

Light travels in two media A and B with speeds 1.8 × 10⁸ m s⁻¹ and 2.4 × 10⁸ m s⁻¹ respectively. Then the critical angle between them is

A ray of light travelling in a transparent medium of refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45°. For which of the following value of μ the ray can undergo total internal reflection?

From a point source, a light falls on a spherical glass surface (μ = 1.5 and radius of curvature 10 cm). The distance between point source and glass surface is 50 cm. The position of image is

A convex lens of focal length 0.2 m and made of glass (μ_glass = 1.5) is immersed in water (μ_water = 1.33). The change in the focal length of the lens is

A double convex lens, made of a material of refractive index μ₁, is placed inside two liquids of refractive indices μ₂ and μ₃ as shown. μ₂ > μ₁ > μ₃. A wide, parallel beam of light is incident on the left. The lens will give rise to

What is the refractive index of material of a planoconvex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?

The radii of curvature of the surfaces of a double convex lens are 20 cm and 40 cm respectively, and its focal length is 20 cm. What is the refractive index of the material of the lens?

Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

Radii of curvature of a converging lens are in the ratio 1 : 2. Its focal length is 6 cm and refractive index is 1.5. Then its radii of curvature are

Which of the following forms a virtual and erect image for all positions of the object?

An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4. The focal length of the lens is

A tree is 18.0 m away and 2.0 m high from a concave lens. How high is the image formed by the given lens of focal length 6 m?

A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively

Two lenses of focal lengths 20 cm and −40 cm are held in contact. The image of an object at infinity will be formed by the combination at

A concave mirror of focal length f₁ is placed at a distance of d from a convex lens of focal length f₂. A beam of light coming from infinity and falling on this convex lens - concave mirror combination returns to infinity. The distance d must equal

Two identical glass (μ_g = 3/2) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μ_w = 4/3). The focal length of the combination is

A ray of light passes through an equilateral prism (refractive index 1.5) such that angle of incidence is equal to angle of emergence and the later is equal to 3/4th of the angle of prism. The angle of deviation is

The angle of minimum deviation for prism of angle π/3 is π/6, if the velocity of light in vacuum is 3 × 10⁸ m s⁻¹, then the velocity of light in material of the prism is

For a glass prism (μ = √3), angle of minimum deviation is equal to angle of the prism. The angle of the prism is

A small angle prism (μ = 1.62) gives a deviation of 4.8°. The angle of prism is (Assume min. deviation)