Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

In the given figure, diameter of lens equals:

A
$$FO$$

B
$$2FO$$

C
$$3FO$$

D
$$4FO$$

Solution

Focal length, $$f=FO = \dfrac{radius}{2}$$
Diameter = $$2 \times radius$$
Diameter$$= 4 FO $$
Question 2
1 / -0

A reflecting surface which is a part of a sphere is called:

A
concave mirror

B
convex mirror

C
spherical mirror

D
all of these

Solution

A reflecting surface which is a part of a sphere is called a spherical mirror. It is made by silvering a piece of glass, which is part of a hollow sphere.
Question 3
1 / -0

The refractive index of a medium is ______ to the speed of light in the medium.

A
directly proprtional

B
inversely proportional

C
independent

D
exponentially increasing

Solution

Correct answers is (b).

As per law of refraction the speed with which light propagates through a dielectric medium is inversely proportional to the refractive index of the medium.
Question 4
1 / -0

According to laws of refraction, refraction of light at the boundary between two different regions follow:

A
that the incident ray, the normal at the point of incidence and the refracted ray, all lie in the same plane.

B
that for a given pair of media and given colour of light, the ratio of the sine of angle of incidence to the sine of angle of refraction is constant.

C
both A and B

D
neither A nor B

Solution

Refraction of light obeys the following two laws:
1. The incident ray, the normal at the point of incidence and the refracted ray, all lie in the same plane.
2. For a given pair of media and given the colour of light, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant.

The second postulate is also known as Snell's Law which is as:
$$\dfrac{sini}{sinr}=\dfrac{n_2}{n_1}$$= $$constant$$
Question 5
1 / -0

_______ lens is thickest in the middle and ________ lens is thinnest at the middle

A
Concave, Convex

B
Convex, Concave

C
Convex, Plane

D
Convex, Convex

Solution

Convex lens is thickest in the middle and concave lens is thinnest at the middle
Question 6
1 / -0

The refractive index of a medium:

A
is defined with respect to another medium

B
is an absolute constant for a medium

C
depends on the frequency of the light in the medium

D
is more for higher intensity of light ray
Question 7
1 / -0

Given a trace of light, refractive index of the medium can be found by using:

A
universal Law of light

B
Shell's Law

C
Snell's Law

D
Hooke's Law

Solution

According to Snell's Law,
$$\mu = \dfrac{sin\ i}{sin\ r}$$
where
$$\mu: \text{Refractive index of the medium 2 w.r.t. medium 1}$$
$$i: \text{Angle of incidence}$$
$$r: \text{Angle of refraction}$$

If trace of light is known, then $$i$$ and $$r$$ are known and hence $$\mu$$ can be found.
Question 8
1 / -0

Second law of refraction is also called:

A
Shell's Law

B
Snell's Law

C
Hooke's Law

D
none of the above

Solution

Second Law of refraction is also called the Snell's Law. According to it,
$$\mu =\dfrac{sin\ i}{sin\ r} = constant$$
Question 9
1 / -0

Tracing the light ray in a glass slab, which of the following quantities can be evaluated.

A
Frequency of light wave

B
Refractive index of slab

C
Density of glass slab

D
Components of colour present in the incident light
Question 10
1 / -0

SI unit of refractive index is

A
$$\displaystyle m/s$$

B
$$\displaystyle Hz$$

C
$$\displaystyle \overset { \circ }{ A } $$

D
None

Solution

Refractive index is defined as: The ratio of the speed of light in a vacuum to its speed in a specific medium.
The refractive index has no unit as it is the ratio of two similar Quantities.

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Re-Attempt Weekly Quiz Competition

Light Reflection and Refraction Test - 53

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Light Reflection and Refraction Test - 53

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SHARING IS CARING

Question 1

$$FO$$

$$2FO$$

$$3FO$$

$$4FO$$

Solution

Question 2

concave mirror

convex mirror

spherical mirror

all of these

Solution

Question 3

directly proprtional

inversely proportional

independent

exponentially increasing

Solution

Question 4

that the incident ray, the normal at the point of incidence and the refracted ray, all lie in the same plane.

that for a given pair of media and given colour of light, the ratio of the sine of angle of incidence to the sine of angle of refraction is constant.

both A and B

neither A nor B

Solution

Question 5

Concave, Convex

Convex, Concave

Convex, Plane

Convex, Convex

Solution

Question 6

is defined with respect to another medium

is an absolute constant for a medium

depends on the frequency of the light in the medium

is more for higher intensity of light ray

Question 7

universal Law of light

Shell's Law

Snell's Law

Hooke's Law

Solution

Question 8

Shell's Law

Snell's Law

Hooke's Law

none of the above

Solution

Question 9

Frequency of light wave

Refractive index of slab

Density of glass slab

Components of colour present in the incident light

Question 10

$$\displaystyle m/s$$

$$\displaystyle Hz$$

$$\displaystyle \overset { \circ }{ A } $$

None

Solution

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