Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 42

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Question 1
1 / -0

The second law of refraction is also named after its discoverer as :

A
Newton's law

B
Faraday's law

C
Snell's law

D
Charles' law

Solution

The Second Law of Refraction is also known as Snell’s Law of Refraction.

As per which the ratio of the sine of the angle of incidence and sine of the angle of refraction is always constant for the light of specific colour and for the pair of given media.

The constant is called refractive index of the second medium in relation to the first medium.
$$\dfrac { sin\ i }{ sin\ r } =constant$$
Question 2
1 / -0

The focal length is the distance from the optical center of the lens to its principal _________

A
focus.

B
axis.

C
center of curvature.

D
lens.

Solution

The focal length is the distance between the principal focus and the optical center of the lens.
Question 3
1 / -0

Fill in the blank.
A _____ is a piece of transparent glass bounded by two spherical surfaces.

A
lens

B
mirror

C
both

D
none

Solution

A lens is a piece of transparent glass bounded by two spherical surfaces.

Answer is lens.
Question 4
1 / -0

The center of the lens is called :

A
Principle focus

B
Principle axis

C
Optical centre

D
None

Solution

The center of the lens is called Optical Centre .This is a point on the principal axis of a lens through which light passes without any deviation, a ray of light passing through the optical center will not change its direction.
Question 5
1 / -0

The second law of reflection states that the incident ray, the refracted ray, and the normal at the point of incidence, all lie in the ................ plane.

A
parallel

B
same

C
perpendicular

D
different

Solution

The correct option is (B).

The second law of reflection states that the incident ray, the refracted ray, and the normal at the point of incidence, all lie in the same plane.
Question 6
1 / -0

A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces

A
a convergent beam of light

B
a divergent beam of light

C
a parallel beam of light

D
a patch of coloured

Solution

When a bulb is placed at focus of converging lens then the light rays of bulb from focus will get refracted from the convex lens and become to parallel to principal. They produce a parallel beam of light after refraction from convex lens.
Option C is correct.
Question 7
1 / -0

What is the shape of lens C as shown in figure ?

A
Plano-convex

B
Plan-concave

C
Convex

D
Concave

Solution

One side of lens C is plane and the other is convex and the glass is thicker at the center and thinner at the ends.
Thus it is known as a plano-convex lens.
So Shape of C is plano-convex.
Question 8
1 / -0

Which of the following rays diagrams is correct for the ray of light incident on a lens shown in figure ?

A

B

C

D

E

Solution

When an incident light ray passing through focus 'F' of convex lens and refracted from lens then it goes parallel to the principle axis.

Thus Option A is correct.
Question 9
1 / -0

.......... happens when a wave passes from one medium to another at an angle.

A
Refraction

B
Reflection

C
Dispersion

D
Scattering

Solution

Refraction is a phenomenon in which when a ray passes from one medium to another it bends away from its straight-line path due to the difference in optical densities or refractive indices of the two mediums.
Option A is correct.
Question 10
1 / -0

From the shown figure, name the lens which is plano-concave :

A
D

B
A

C
B

D
C

Solution

Plano-concave lens:
The lens is flat on one side and diverging or concave (curved inside) on the other side. These lenses are thinner at centre and thicker at ends.
From the given shapes we can say that lens D is plano-concave lens. Its left side is plane and right side is concave.