NEET Physics Ray Optics Class 12 Questions

Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is 3/2 is

The energy of a photon of light of wavelength 450 nₘ is

When light propagates through a material When light propagate permittivity εᵣ and relative medium of relative the velocity of light, v is given permeability μᵣ, the light in vacuum) by: (c = velocity of light in vacuum)

A point object is kept 60 cm in front of a spherical convex surface (μ = 1.5, radius of curvature 40 cm). The image formed is

The critical angle for a ray of light passing from glass to water is minimum for

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

A beam of light travels from air into a medium. Its speed and wavelength in the medium are 1.5 × 10⁸ ms⁻¹ and 230 nₘ respectively. The wavelength of light in air will be.

An equiconvex lens is cut into two halves along (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:

A vessel of depth 'd' is half filled with oil of refractive index n₁ and the other half is filled with water of refractive index n₂. The apparent depth of this vessel when viewed from above will be-

The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (figure). Which of the four rays correctly shows the direction of reflected ray?

Light travels in two media M₁ and M₂ with speeds 1.5 × 10⁸ m s⁻¹ and 2.0 × 10⁸ m s⁻¹ respectively. The critical angle between them is:

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resulting power?

Light of two different frequencies whose photons has energies 1 eV and 2.5 eV respectively, successively illuminates a metal of work function 0.5 eV. The ratio of maximum kinetic energy of the emitted electron will be

Assertion (A): In Young’s double slit experiment all fringes are of equal width. Reason (R): The fringe width depends upon wavelength of light (λ) used, distance of screen from plane of slits (D) and slits separation (d).

A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options best describe the image formed of an object of height 2 cm placed 30 cm from the lens?

Which colour of white light travels slowest, in glass

A convex lens has power P. It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figure). Choose the incorrect option for the reported pieces.

A monochromatic light of frequency \( 3 \times 10¹⁴ \text{ Hz} \) is produced by a LASER, emits the power of \( 3 \times 10^{-3} \text{ W} \). Find how many number of photons are emitted per second.

A monochromatic light wave with wavelength λ₁ and frequency ν₁ in air enters another medium. If the angle of incidence and angle of refraction at the interface are 45° and 30° respectively, then the wavelength λ₂ and frequency ν₂ of the refracted wave are:

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm, and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?

You are given four sources of light each one providing a light of a single colour- red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

A compound microscope with an objective of 1 cm and eyepiece of 2.0 cm focal length has a tube length of 20 cm. Calculate the magnifying power of microscope is final image is formed at the near point of eye.

A ray of light is incident on a prism ABC in which ∠A = 60° as shown in the figure. The ray will:

For a glass prism (μ = 3) the angle of minimum deviation is equal to the angle of the prism. Find the angle of the prism in degree

Assertion: A Thick lens produces a coloured image of an object illuminated by white light. Reason: The refractive index of the material of lens is different for different wavelengths of light.

A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is

The magnifying power of a compound microscope increases with when

Image formed in compound microscope is

A single slit of width a is illuminated by a monochromatic light of wavelength 600 nₘ. The value of 'a' for which first minimum appears at θ = 30° on the screen will be :

Two positions of convex lens for which image of the object is formed on the same screen are 40 cm and 80 cm from the object. The focal length of the lens is

Given below are two statements : Statement I: When the white light passed through a prism, the red light bends lesser than yellow and violet. Statement II: The refractive indices are different for different wavelengths in dispersive medium. In the light of the above statements, choose the correct answer from the options given below :

The figure shows two converging lenses. The light rays are incident parallel to principal axis on first lens as shown. The distance between the lenses so that the emergent rays are also parallel to principal axis is

In the figure, a ray of light is perpendicular to the face AB of a glass prism (μ = 1.52). Find the value of θ so that the ray is totally reflected at face AC, if the prism is immersed in water (μ = 1.33). take sin 60° = 0.875

A ray of monochromatic light is passing through an equilateral prism (ABC) as shown in the figure. The refracted ray (QR) is parallel to its base (BC) and the angle of incidence (i) is 50°. Then the angle of deviation (δ) is:

In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction:

A microscope has an objective of focal length 2 cm, eyepiece of focal length 4 cm and the tube length of 40 cm. If the distance of distinct vision of eye is 25 cm, the magnification in the microscope is

In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power (p) and magnification (m) for each lens will be, respectively –

A light ray enters through a right angled prism at point P with the angle of incidence 30° as shown in figure. It travels through the prism parallel to its base BC and emerges along the face AC. The refractive index of the prism is:

A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is:

Light travels a distance x in time t₁ in air and 10x in time t₂ in another denser medium. What is the critical angle for this medium?

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?

Two thin lenses are of same focal lengths (<em>f</em>), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:

A light ray falls on a glass surface of refractive index √3, at an angle 60°. The angle between the refracted and reflected rays would be:

A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is:

Two transparent media A and B are separated by a plane boundary. The speed of light in those media are 1.5 × 10⁸ m/s and 2.0 × 10⁸ m/s, respectively. The critical angle for a ray of light for these two media is:

Find the value of the angle of emergence from the prism. Refractive index of the glass is √3.

A convex lens ‘A’ of focal length 20 cm and a concave lens ‘B’ of focal length 5 cm are kept along the same axis with a distance ‘d’ between them. If a parallel beam of light falling on ‘A’ leaves ‘B’ as a parallel beam, then the distance ‘d’ in cm will be :

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :

A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of:

Assume that light of wavelength 600 nₘ is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is: