C-09 — Refraction of light

What is the exact velocity of light in vacuum?

The practical value of velocity of light in vacuum used in calculations is —

When light moves from one medium to another, which of the following events does NOT occur?

The factor by which the velocity of light reduces in a medium is called the —

The formula for refractive index of a medium is —

The refractive index of water at 20°C is —

If the refractive index of water is 1.33, the velocity of light in water is approximately —

The refractive index of the glass fiber in a fiber optic cable is —

The velocity of light in a glass fiber of refractive index 1.5 is —

The unit of refractive index is —

The refractive index of vacuum is —

The refractive index of air, taken as 1 in calculations, is actually —

The refractive index of normal glass is —

The refractive index of diamond is —

The velocity of light in diamond (n = 2.42) is approximately —

Why is the absolute refractive index of any medium always greater than 1?

The refractive index of a medium depends on —

The angle between the incident ray and the normal at the point of incidence is called —

The angle between the refracted ray and the normal is called —

According to the first law of refraction —

The mathematical form of the second law of refraction is —

The second law of refraction is also known as —

If light enters from air to a medium, the refractive index of the medium equals —

When light passes from a rarer medium to a denser medium, the refracted ray —

When light passes from a denser medium to a rarer medium, the refracted ray —

In optics, "denser medium" means —

A ray of light is incident on a medium of $n = 1.6$ at an angle of incidence 45°. The angle of refraction is approximately —

A ray is incident from air to another medium at 60° and refracted at 45°. The refractive index of the second medium is —

In the coin-in-the-cup experiment, the coin becomes visible after pouring water because —

As the angle of incidence increases at a boundary, what happens to the amount of reflected light?

The refractive index of a medium with respect to another medium —

If $n$ for water is 1.33 and $n$ for glass is 1.52, the refractive index of glass with respect to water is —

The refractive index of water with respect to glass is —

The refractive index of diamond with respect to water is —

The refractive index of water with respect to diamond is —

The refractive index of diamond with respect to glass is —

The refractive index of glass with respect to diamond is —

Total internal reflection occurs when light passes from —

The angle of incidence in a denser medium for which the angle of refraction in the rarer medium becomes 90° is called —

If light passes from a medium of refractive index $n_1$ (denser) to one of $n_2$ (rarer), the critical angle $\theta_c$ is given by —

The critical angle for the glass–air boundary (n for glass = 1.52) is —

The critical angle for the glass–water boundary (n for glass = 1.52, n for water = 1.33) is —

For total internal reflection to occur, the angle of incidence in the denser medium must be —

Light is incident at 75° from a medium of refractive index 1.45 onto an air boundary. What happens?

The critical angle for a medium of refractive index 1.45 (with air on the other side) is —

In total internal reflection —

Consider the following statements about total internal reflection:

A rainbow is formed primarily due to —

A rainbow always forms in the sky —

In a rainbow, different colors are seen as separate bands because —

The phenomenon of a mirage occurs due to —

In a desert, the air near the heated sand —

A mirage is observed only —

While driving on a hot road in summer, water appears far ahead. This is because —

Consider the following statements about a mirage:

Optical fibers are used to replace —

The inner part of an optical fiber is called the —

In an optical fiber, which of the following relations is true?

Light is transmitted through an optical fiber by —

In modern optical fibers, the type of light usually used is —

Why is infrared light preferred over visible light in optical fibers?

In an optical fiber, $n_{core} = 1.50$ and $n_{clad} = 1.45$. The minimum angle of incidence for total internal reflection is —

In optics, a prism is a transparent medium —

When a ray of light passes through a prism, it deviates towards —

At the first surface of a prism, light bends —

White light is split into its component colors by a prism because —

The dispersion of white light by a prism was first demonstrated by —

A periscope is mainly used in —

A periscope made with prisms is more effective than one made with ordinary mirrors because —

In binoculars, prisms are used mainly to —

A lens is created using —

Lenses are NOT used in —

A convex lens is —

A concave lens is —

A convex lens is also called a —

A concave lens is also called a —

The centres $C_1$ and $C_2$ in a lens are called —

A thin lens is one in which —

The point at the middle of a thin lens through which a light ray passes without deviation is called the —

The lens that makes small things appear bigger is —

When parallel rays of light fall on a concave lens, after refraction they —

The focal point of a concave lens is found by —

The focal length of a lens is the distance between —

The focal length of a lens —

For a concave lens, a ray parallel to the principal axis after refraction —

A ray passing through the optical centre of a thin lens —

For an object placed near a concave lens, the image is —

Consider the following about a concave lens forming an image:

When parallel rays of light fall on a convex lens, they —

If a point source of light is placed at the focal point of a convex lens, the emerging rays will be —

For a convex lens, a ray parallel to the principal axis, after refraction —

When an object is placed between the optical centre and focal point of a convex lens, the image is —

When an object is placed outside the focal length but inside twice the focal length of a convex lens, the image is —

When an object is placed at exactly twice the focal length of a convex lens, the image —

When an object is placed beyond twice the focal length of a convex lens, the image is —

If an object is placed at infinity in front of a convex lens, the image is formed —

Consider the following statements for a convex lens with the object inside the focal length:

To find the focal length of a convex lens, light from a distant object is focused on a wall. The focal length equals —

If a convex lens forms a real image at the position of a previous object (kept beyond 2f), then placing the object at the previous image location —

The power of a lens is defined as —

The unit of power of a lens is —

In the formula $P = 1/f$, $f$ must be expressed in —

The smaller the focal length of a converging lens —

The power of a convex lens is —

The power of a concave lens is —

If the power of a lens is 2.5 D, its focal length is —

Where will the image of an object be when it is placed in a denser medium and looked at from a rarer medium?

Based on Figure 9.30 (ray incident along the normal at point P), what is the angle of refraction?

In Figure 9.30, what will happen if the angle of incidence is increased (light from denser to rarer medium)?

The ray diagram usually used to draw the image for a convex lens uses — (i) parallel ray through focus, (ii) ray through focus emerging parallel, (iii) ray through optical centre going straight.

Which is the unit of power of a lens?

What is a lens?

How can the nature (convex/concave) of a lens be identified without touching it?

Shiuli's spectacles have power $-2$ D. The focal length of the lens is —

For Shiuli's $-2$ D lens with an object placed 1 m away, the image formed will be —

A negative power lens (e.g. $-2$ D) corresponds to a —

Which of the following best defines refraction of light?

A convex lens is called a converging lens because —

A mirage is formed because —

The focal length of a concave lens is taken as negative because —