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:

Consider the figure,

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 :

The expression of magnification is given by, m = f₀/fₑ. Substitute the values as, m = 15/1 = 15

The focal length of lens can be calculated as, m = \frac{f}{u + f} \frac{1}{2} = \frac{f}{-²⁰⁺ f} -²⁰⁺ f = -2f f = 6.66 \text{ cm}

If f₀ = 5 cm, λ = 6000Å, a = 1 cm for a microscope, then what will be its resolving power.

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 ?

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

Assertion: Incoming light reflected by earth is partially polarized. Reason: Atmospheric particle polarize the light.

Consider the lens equation. 1/v - 1/u = 1/f Substitute the values. 1/v - 1/20 = 1/25 1/v = 1/25 - 1/20 = (4 - 5)/100 v = -100 The magnification is given as,

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.

Rayleigh scattering can be considered as elastic collisions of photons with massive particles because in Rayleigh scattering, the energy of incident and scattered is same.

Diamond glitter brilliantly because light enters in diamond suffers total internal reflection.

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.

Which of the following produces virtual image?

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

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.

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.

Consider the following figure.

Consider the required figure.

Consider f be the effective focal length of the system, 1/f = 2/fₑ + 1/fₘ 1/f = 2/12 + 1/∞ f = -6 cm From mirror formula, 1/v + 1/u = 1/f 1/v + 1/-20 = 1/-6 v = -8.6 cm

The ratio of wavelength of the incident and refracted wave will be \mu :1.

Consider the figure shown below.

Consider the expression, [Image of optical setup]. So, the intensity of final emergent light is,

For concave mirrors, \( \frac{2}{R} = \frac{1}{v} + \frac{1}{u} \) or \( \frac{2}{-R} = \frac{1}{v} + \frac{1}{-u} \) leading to \( \frac{1}{v} - \frac{1}{U} = \frac{2}{R} = \frac{R - 2U}{UR} \) and \( v = \frac{RU}{R - 2U} \).

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

Deviation = zero \((\mu_1 - 1)A_¹⁺ (\mu_2 - 1)A_2 = 0\) \(A_2 = \frac{-0.5}{0.75} \times 15^\circ = 10^\circ\)

Consider the ray diagram for the refraction given below. The maximum value of angle o 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.

Using mirror formula, \frac{1}{v} + \frac{1}{u} = \frac{1}{f} So, \frac{dv}{dt} = \frac{v²}{u²} \left( \frac{du}{dt} \right) \frac{dv}{dt} = - \left( \frac{f}{u-f} \right) \frac{du}{dt} = \frac{1}{15} \text{ m/s}

Sky is maximum red in morning is a true assertion and smallest wavelength scatter maximum is a true reason.

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.

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.

The refractive index of material changes according to the material. So, the speed also changes according to the material. Due to speed change, the dispersion of light occurs. The dispersive power does not depend on prism angle. Thus, both statements are true but reason is not correct explanation of assertion.

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.