AIIMS Physics Ray Optics Class 12 Questions

A person wear normal spectacles in which the distance of glasses and eyes is approximately 2 cm, then power required is -5D. If he wears contact lens, then the required power is:

For the given figure find the acceleration of $1\text{ kg}$ block if string is massless and mass of the pulley is $2\text{ kg}$ and diameter of puller is $0.2\text{ m}$.

Angular magnification of telescope if focal length of objective and eye lenses are 10 cm and 10 mm respectively and tube length is 11 cm:

What is the dimension of Luminous flux :

For a telescope, focal length of objective lens is 15 cm and focal length of eye piece is 10 mm. If tube length is 16 cm, then find the magnification:

Calculate the focal length of the given lens if the magnification is $-0.5$.

If $\text{f}_0 = 5 \text{ cm}$, $\lambda = 6000\text{\AA}$, $\text{a} = 1 \text{ cm}$ for a microscope, then what will be its resolving power.

How can we change a camera from F/4 to F/5.6 ?

Assertion: Incoming light reflected by earth is partially polarized.

Reason: Atmospheric particle polarize the light

Find magnification for lens.

Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances. Reason: The focal length of a convex mirror is always taken negative.

Assertion : Rayleigh scattering can be considered as elastic collisions of photons with massive particles.

Reason : In Rayleigh scattering, the energy of incident and scattered is same

Assertion : Diamond glitters brilliantly. Reason : Diamond does not absorb sunlight.

Assertion: Dispersion of light occurs because velocity of light in a material depends upon its colour.

Reason: The dispersive power depends only upon the material of the prism, not upon the refractive angle of the prism.

In a simple microscope of focus length 5 cm final image is formed at D, then its magnification will be:

Which of the following produces virtual image?

If focal length of human eye is 2 cm, then find the focal length of contact lens. Such that a combined focus of 2.5 cm is obtained after using contact lens.

Find the minimum wavelength of X-rays emitted by an X-ray tube which is operating at an accelerating voltage of $15\text{ kV}$.

Two lenses of focal length 100 cm and 8 cm; one convex and other concave are placed on the same optic axis at a separation of 90 cm, as shown in figure. An object O is placed at a distance 50 cm from the convex lens. Find the magnification of the two lens system.

In the figure shown, $S$ is the source of white light kept at a distance $x_0$ from the plane of the slits. The source moves with a constant speed $u$ towards the slits on the line perpendicular to the plane of the slits and passing through the slit $S_1$. Find the instantaneous velocity (magnitude and direction) of the central maxima at time $t$ having range $0 \le t \ll \frac{x_0 - d}{u}$. Assume that $D \gg d$.

Light is incident on a polarizer with intensity $I_0$. A second prism called analyzer is kept at an angle of $15^\circ$ from the first polarizer, then the intensity of final emergent light will be:

A convex lens of focal length $12\text{ cm}$ is placed in contact with a plane mirror. If the object is placed at $20\text{ cm}$ from the lens, the position of final image is

The wavelength of a monochromatic light in vacuum is $\lambda$. It travels from vacuum to a medium of absolute refractive index $\mu$. The ratio of wavelength of the incident and refracted wave is:

Find the distance of the image from the convex lens.

Light is incident on a polarizer. A second prism called analyzer is kept at an angle of $15^\circ$ from the first polarizer then the intensity of final emergent light will be:

An object is moving with speed $v_o$ towards a spherical mirror with radius of curvature $R$, along the central axis of the mirror. The speed of the image with respect to the mirror is ($U$ is the distance of the object from mirror at any given time $t$):

A thin prism of angle $15^\circ$ made of glass of refractive index $\mu_1 = 1.5$ is combined with another prism of glass of refractive index $\mu_2 = 1.75$. The combination of the prisms produces dispersion without deviation. The angle of the second prism should be:

A light ray falls on a rectangular glass slab as shown. The index of refraction of the glass, if total internal reflection is to occur at the vertical face is

A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is:

Assertion: Sky is maximum red in morning

Reason: Smallest wavelength scatter maximum.

Assertion: When a convex lens (μ₉ = 3/2) of focal length f is dipped in water, its focal length becomes 4/3 f. Reason: The focal length of convex lens in water becomes 3f.

Assertion : Dispersion of light occurs because velocity of light in a material depends upon its colour.

Reason : The dispersive power depends only upon the material of the prism, not upon the refracting angle of the prism.

A rod of length 10 cm lies along principle axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image

A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focused on a distant object in such a way that parallel rays emerge from the eye lens. If the object subtends an angle of at the objective, the angular width of the image is

In the following questions, a statement of assertion is given followed by a corresponding statement of reason. Assertion: Corpuscular theory fails in explaining the velocity of light in air and water. Reason: According to Corpuscular theory is that light should travel faster in denser medium than rarer medium.

Assertion: The focal length of lens does not change when red light is replaced by blue light. Reason: The focal length of lens does not depends upon colour of the light used.

Light wave enters from medium 1 to medium 2. Its velocity in 2ⁿᵈ medium is double from 1ˢᵗ. For total internal reflection the angle of incidence must be greater than

A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through opposite face is 4 cm. The refractive index of material of cube is

Focal length of objective and eye piece of telescope are 200 cm and 4 cm respectively. What is the length of telescope for normal adjustment?

For a situation shown in figure, find the refractive index of glass so that it will suffer total internal reflection at the vertical surface.

Assertion: Electron microscope has more resolving power than optical microscope. Reason: We can control the energy of electron.

Assertion: When an object is placed between two plane parallel mirrors, then all the images found are of equal intensity. Reason: In case of plane parallel mirrors, only two images are possible.

The molar specific heat of a gas as given from the kinetic theory is $\frac{5}{2}R$. If it is not specified whether it is $C_P$ or $C_V$, one could conclude that the molecules of the gas

Consider the ray diagram for the refraction given below. The maximum value of angle θ for which the light suffers total internal reflection at the vertical surface, is

The near point and far point of a person are 40 cm and 250 cm respectively. Determine the power of the lens he/she should use while reading a book kept at distance 25 cm from the eye.

Assertion (A) The relation among u, v and f for the spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.

Reason (R) The laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.

Polaroid glass is used in sun glasses because

In a Young's double slit experiment the spacing between the slits is 0.3 mm and the screen is kept at a distance of 1.5 m. The second bright fringe is found 6 mm from the central fringe. The wavelength of the light used in the experiment is

The frequency of a light wave in a material is 2 × 10¹⁴ Hz and wavelength is 5000 Å. The refractive index of material will be

Assertion : If optical density of a substance is more than that of water then the mass density of substance can be less than water. Reason : Optical density and mass density are not related.