Light Test

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Light Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

What is the function of the iris in human eye ?

A
Iris restricts the light to pass through the eye over to the retina.

B
Iris provides protection to the eye from microorganisms.

C
Iris controls the size of the pupil and hence the amount of light entering the eye.

D
Iris allows colour detection in eye.

Solution

The function of the iris in the eye is to control the amount of light that reaches the retina. It does this by changing the size of the pupil, the transparent window that allows light into the eye's interior.
Question 2
1 / -0

Which part of human eye controls the amount of light entering the eye?

A
Cornea

B
Retina

C
Pupil

D
Iris

Solution

Correct answer is (D)
Iris is the ring of pigmented tissue surrounding the pupil that varies in color from person to person, it contract and dilates to control the amount of light entering the eye through the pupil. The pupil is the opening in the center of the iris where light enters the eye.
Question 3
1 / -0

Identify the part "B" from the shown figure of human eye :

A
Retina

B
Iris

C
Cornea

D
Pupil

Solution

Correct answer is (B)
Iris is a thin diaphragm composed mostly of connective tissue and smooth muscle fibers which is visible through the clear cornea as the colored disc inside of the eye. It is situated between the cornea and the crystalline lens.
Question 4
1 / -0

What is the name of the circular aperture through which light enters the eye ?

A
Iris

B
Pupil

C
Cornea

D
Optic Nerve

Solution

Correct answer ( B )
The circular aperture through which light enters the eye is known as the pupil. It is the black circle in the center of the iris when the light reaches the tissues at the back of the eye, it is absorbed making the pupil look black. The pupil controls the amount of light that enters the eye.
Question 5
1 / -0

The reflection taking place from the walls of a building is called:

A
regular reflection

B
diffused reflection

C
multiple reflection

D
internal reflection

Solution

The reflection taking place from the walls of a building is called diffused reflection.
In diffused reflection, the reflected rays are not parallel to each other. This kind of reflection occurs from a coarse surface. Walls of a building being coarse surfaces, give rise to diffused reflections.
Question 6
1 / -0

How is the angle of incidence related to the angle of reflection ?

A
It's greater

B
It's the same

C
It's smaller

D
It's not focused

Solution

The normal line divides the angle between the incident ray and the reflected ray into two equal angles. The angle between the incident ray and the normal is known as the angle of incidence. The angle between the reflected ray and the normal is known as the angle of reflection.
i.e:$$\angle i=\angle r$$
Question 7
1 / -0

Two mirrors are inclined at an angle 60, an object is placed asymmetrically between them. Then number of images formed will be :

A
6

B
5

C
7

D
9

Solution

If the image of an object is viewed in two plane mirrors that are inclined to each other more than one image is formed. The number of images depends on the angle between the two mirrors.
The number of images formed in two plane mirrors inclined at an angle $$A$$ to each other is given by the formula below for the different cases:
Case(1) : If (360/A) $$= Even$$ then,
Number of images $$= (360/A) - 1$$
Case(2) : If  (360/A) $$= Odd$$,
(1) If mirrors are placed symmetrically then,
Number of images $$= (360/A) - 1$$
(2) If mirrors are placed unsymmetrically then,
Number of images $$= (360/A) $$
Here, angle of inclination $$= 60^0$$
So, (360/A) $$= (360/60) = 6$$ [Which is even]
Hence, The no. of images will be $$= (360/A) -1$$
Substituting $$A$$ as $$60^0$$ in the formula $$(360/60)-1 = 6-1 = 5$$
Hence, the no. of images formed will be $$5$$.
So, $$option(B): 5$$ will be the correct answer.
Question 8
1 / -0

Dispersion of white light into its constituent colours occurs during

A
Reflection at a plane mirror

B
Reflection at a concave mirror

C
Internal reflection inside a spherical drop of water

D
Refraction at the boundary of a transparent medium

Solution

Upon entry of white light at the first boundary of a triangular prism, there will be a slight separation of the white light into the component colours of the spectrum. Upon exiting the triangular prism at the second boundary, the separation becomes even greater and ROYGBIV is observed in its splendor. Hence, Dispersion of white light into its constituent colours occurs during refraction at the boundary of a transparent medium.
Question 9
1 / -0

In order to get 5 distinct images of an object, two plane mirrors should be placed at an angle of:

A
$$30^0$$

B
$$60^0$$

C
$$75^0$$

D
none of these

Solution

Let the angle between the mirrors be $$\theta$$.
So, $$5=\dfrac{360}{\theta}-1$$
or, $$\theta=\dfrac{360}{6}=60^0$$
Question 10
1 / -0

To get 9 multiple images the angle between the plane mirrors should be:

A
$$60^{\circ}$$

B
$$36^{\circ}$$

C
$$45^{\circ}$$

D
$$90^{\circ}$$

Solution

Number of images formed by plane mirror is given by
$$n=\dfrac{360}{\theta}-1$$
$$9=\dfrac{360}{\theta}-1$$
$$\theta= \dfrac{360}{10}=36^0$$

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Re-Attempt Weekly Quiz Competition

Light Test - 34

Result

Light Test - 34

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Rank

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SHARING IS CARING

Question 1

Iris restricts the light to pass through the eye over to the retina.

Iris provides protection to the eye from microorganisms.

Iris controls the size of the pupil and hence the amount of light entering the eye.

Iris allows colour detection in eye.

Solution

Question 2

Cornea

Retina

Pupil

Iris

Solution

Question 3

Retina

Iris

Cornea

Pupil

Solution

Question 4

Iris

Pupil

Cornea

Optic Nerve

Solution

Question 5

regular reflection

diffused reflection

multiple reflection

internal reflection

Solution

Question 6

It's greater

It's the same

It's smaller

It's not focused

Solution

Question 7

6

5

7

9

Solution

Question 8

Reflection at a plane mirror

Reflection at a concave mirror

Internal reflection inside a spherical drop of water

Refraction at the boundary of a transparent medium

Solution

Question 9

$$30^0$$

$$60^0$$

$$75^0$$

none of these

Solution

Question 10

$$60^{\circ}$$

$$36^{\circ}$$

$$45^{\circ}$$

$$90^{\circ}$$

Solution

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