Light Test

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Light Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

If the velocity of light in vacuum is 3 × 10⁸ m/s, the velocity of light in diamond (refractive index of diamond is 2.417) is

A
2 × 10⁸ m/s

B
2.1 × 10⁸ m/s

C
120 m/s

D
1.2 × 10⁸ m/s
Question 2
1 / -0

If a ray of light is incident on a plane mirror at an angle of 20^owith the mirror, what will be the angle of reflection?

A
0^o

B
70^o

C
20^o

D
90^o
Question 3
1 / -0

What is the focal length of a plane mirror?

A
Zero

B
Unity

C
Infinity

D
None of these

Solution

A plane mirror can be considered a spherical mirror of infinite radius of curvature. Focal length is half of the radius of curvature and hence it is infinity.
Question 4
1 / -0

If the magnification has a negative sign, the image is ________ and ________.

A
real, erect

B
virtual, inverted

C
real, inverted

D
virtual, erect
Question 5
1 / -0

When an object is placed between two parallel mirrors, the number of images formed will be

A
eight

B
two

C
thirty-two

D
infinite
Question 6
1 / -0

In old age, people generally have to wear spectacles for reading and writing because

A
their eye lenses start disintegrating

B
they lose the power of accommodation

C
their iris contracts

D
the lenses lose their magnifying power
Question 7
1 / -0

Which of the following options is the main difference between an eye and a camera?

A
Image on the retina is not permanent, it erases after very 1/20 th of a second.

B
The eye lens can change its focal length to accommodate different objects.

C
Both (A) and (B)

D
None of these
Question 8
1 / -0

A dark muscular assembly which controls the size of the opening that regulates the amount of light entering the eye is called

A
pupil

B
retina

C
iris

D
cornea
Question 9
1 / -0

The screen of eye is called

A
pupil

B
retina

C
iris

D
cornea

Solution

Retina is the screen of eye and it is the innermost layer of the eye. The retina is a light sensitive layer at the back of the eye and covers roughly 65% of the interior surface of the eye. It contains two types of light sensitive cells called Rods and Cones.

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Re-Attempt Weekly Quiz Competition

Light Test - 4

Result

Light Test - 4

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SHARING IS CARING

Question 1

2 × 108 m/s

2.1 × 108 m/s

120 m/s

1.2 × 108 m/s

Question 2

0o

70o

20o

90o

Question 3

Zero

Unity

Infinity

None of these

Solution

Question 4

real, erect

virtual, inverted

real, inverted

virtual, erect

Question 5

eight

two

thirty-two

infinite

Question 6

their eye lenses start disintegrating

they lose the power of accommodation

their iris contracts

the lenses lose their magnifying power

Question 7

Image on the retina is not permanent, it erases after very 1/20 th of a second.

The eye lens can change its focal length to accommodate different objects.

Both (A) and (B)

None of these

Question 8

pupil

retina

iris

cornea

Question 9

pupil

retina

iris

cornea

Solution

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2 × 10⁸ m/s

2.1 × 10⁸ m/s

1.2 × 10⁸ m/s

0^o

70^o

20^o

90^o