Optics

Answer: B) A form of energy Explanation: Light is a form of energy that travels in waves and can be seen by the human eye.

Answer: A) Yes Explanation: Light always travels in a straight line, unless it encounters a medium that causes it to bend or refract.

Answer: A) Yes Explanation: Light can travel through a vacuum because it does not require a medium to propagate

Answer: A) 3 x 10^8 m/s Explanation: The speed of light in vacuum or air is a constant value of 3 x 10^8 m/s.

Answer: B) They are directly proportional Explanation: The wavelength and frequency of light are related by the equation c = λν, where c is the speed of light, λ is the wavelength, and ν is the frequency.

Answer: A) Yes Explanation: Different colored light has different wavelengths and frequencies, which are responsible for their distinct colors.

Answer: D) Violet Explanation: Among visible light, violet light has the lowest wavelength.

Answer: C) It is partly reflected and partly refracted Explanation: When light is incident on the interface between two media, it is partly reflected and partly refracted.

Answer: A) The bending of light as it passes through a medium

Answer: A) Refractive index

Answer: A) 30 degrees

Answer: A)red Explanation: Among the visible light, violet light has the lowest wavelength and red light has the highest wavelength.

Answer: A) Its component colours Explanation: When a beam of white light or composite light is refracted through any transparent media such as glass or water, it is split into its component colours. This phenomenon is called as ‘dispersion of light’.

Answer: A) c = ν λ Explanation: The speed of light (c) is equal to the product of its wavelength (λ) and frequency (ν), which is given by the equation c = ν λ.

Answer: D) Violet Explanation: Among the visible colors, violet light has the lowest wavelength.

Answer: B) The incident ray, the refracted ray, and the normal to the refracting surface all lie in the same plane.

Answer: A) Refraction Explanation: When sunlight enters the Earth's atmosphere, the atoms and molecules of different gases present in the atmosphere refract the light in all possible directions.

Answer: D) Scattering

Answer: A) Elastic scattering

Answer: B) Inelastic scattering

The velocity of the light is more in rarer medium because the particles in the rarer medium is freely arranged so light can travel easily

Answer: A) Rayleigh scattering

Answer: D) The fourth power of the wavelength of the light Explanation: Rayleigh's scattering law states that the amount of scattering of light is inversely proportional to the fourth power of its wavelength

Answer: B) Mie scattering Explanation: Mie scattering is responsible for the white appearance of clouds.

Answer: C) Tyndall scattering Explanation: The scattering of light rays by colloidal particles in a colloidal solution is called Tyndall scattering.

Answer: A) The scattering of light by the colloidal particles in a colloidal solution.Explanation: The Tyndall effect is the scattering of light by the colloidal particles in a colloidal solution. It occurs when light passes through a colloidal solution, and the particles in the solution scatter the light in all directions, making the path of the light visible.

the particles in the denser medium is tightly packed so the light can not freely travel as in rarer medium.So the velocity of light in denser medium is less

Answer: D) The interaction of light with the particles of pure liquids or transparent solids, which leads to a change in wavelength or frequency. Explanation: Raman scattering, also known as the Raman effect, is the interaction of light with the particles of pure liquids or transparent solids, which leads to a change in wavelength or frequency. When a parallel beam of monochromatic light passes through a gas, liquid, or transparent solid, a part of the light rays are scattered, and the scattered light contains some additional frequencies or wavelengths other than that of the incident frequency or wavelength.

When a beam of sunlight, enters into a dusty room through a window, then its path becomes visible to us. This is because, the tiny dust particles present in the air of the room scatter the beam of light. This is an example of Tyndall Scattering The scattering of light rays by the colloidal particles in the colloidal solution is called Tyndall Scattering or Tyndall Effect.

Colloid is microscopically small substance that is equally dispersed throughout the another material.example milk,ice cream

Answer: A) Rayleigh scattering Explanation: The scattering of sunlight by the atoms or molecules of the gases in the earth’s atmosphere is known as Rayleigh scattering.

When an object is placed at focus real image is formed at infinity.The size of the image is much larger than its original.

Answer: C) Shorter wavelength colors

Explanation: According to Rayleigh's scattering law, the shorter wavelength colors are scattered much more than the longer wavelength colors.

Answer: B) Mie scattering

Explanation: Mie scattering is caused by pollen, dust, smoke, water droplets, and other particles in the lower portion of the atmosphere.

Answer: C) Tyndall scattering Explanation: The scattering of light rays by the colloidal particles in the colloidal solution is called Tyndall scattering or Tyndall effect.

Answer: A) Convex lens Explanation: A convex lens is thicker at the center than at the edges.

Answer: B) Concave lens Explanation: A concave lens is thinner at the center than at the edges.

Answer: B) Converging lens Explanation: A convex lens is also called a converging lens because it converges a beam of light to a point.

Answer: A) Diverging lens Explanation: A concave lens is also called a diverging lens because it diverges a beam of light.

Answer: A) Convex lens Explanation: A convex lens is used in magnifying glasses because it converges the light to create a magnified image.

Answer: A) Convex lens Explanation: Convex lenses are used in binoculars and cameras to focus the light and create a clear image.

Answer: B) Concave lens Explanation: A concave lens is used to correct nearsightedness by diverging the light and moving the focal point farther back.

Answer: A) Convex lens

Explanation: A convex lens is used to correct farsightedness by converging the light and moving the focal point forward.

Answer: A) A lens with one flat and one convex surface Explanation: A plano-convex lens has one flat surface and one convex surface.

Answer: D) M = ho/hi

Explanation: The magnification of a lens can be calculated using the formula M = ho/hi, where ho is the height of the object and hi is the height of the image.

Answer: C) Cylindrical lens Explanation: A cylindrical lens is used to correct astigmatism, which is an uneven curvature of the cornea that causes distorted vision.

Answer: A) Convex lens Explanation: A convex lens can be used to create a panoramic photo by capturing a wider field of view than a flat lens.

According to properties of light ,light doesn't require any medium for its propagation.It can travel through vaccum.

The SI unot of power of lens is dioptre.It is denoted by D symbol

A normal human being can clearly see the object with the 25 cm.If the person can not see the object with 25cm he/she is suffering with eye defects

The person who can see the object with the minimum distance without a strain is called least distance.

According to Cartesian sign convention the object always placed at the left side of the lens

due to this the image of the objects are formed behind the retina.This defect can be corrected by using convex lens.The focal length of the convex lens is used for the defect is computed as follows: