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How do spectacles work?

Lesson 31 of 100 • 140 upvotes • 3:12 mins

Unacademy Bytes

In this bytes video find out about the abnormalities of vision and how spectacles work to correct vision.

Unacademy Bytes Part 4

100 lessons • 4h 52m

1

Overview of the course

0:11 mins

2

The Life of Aryans in the Vedic age

3:32 mins

3

What is Neurogenesis?

2:41 mins

4

What is Pax Romana?

2:47 mins

5

Economic impact of British colonial rule in India

3:30 mins

6

Effects of Ultraviolet on humans

3:58 mins

7

The Gupta Dynasty

3:54 mins

8

How massive is the Milky Way?

3:17 mins

9

The Chera Dynasty

2:47 mins

10

The Chalukya dynasty

3:35 mins

11

The American Civil War

4:17 mins

12

The attack on Pearl Harbor

3:47 mins

13

The Satavahana Dynasty

3:48 mins

14

The Delhi Sultanate

4:29 mins

15

The Korean War

2:55 mins

16

The invention of Laser

2:46 mins

17

The importance of hormones

2:37 mins

18

What is Gluten?

3:15 mins

19

Is the Great Barrier Reef dying?

3:07 mins

20

What is Continental Drift?

3:16 mins

21

What is Green Building?

2:47 mins

22

Why are most airplanes white in color?

2:37 mins

23

What are sand dollars?

2:07 mins

24

Do changes in weather make you sick?

2:22 mins

25

What is Paleomagnetism?

2:47 mins

26

What is Higgs Boson?

2:52 mins

27

What is Photoelectric effect?

2:24 mins

28

How do sunspots affect the Earth?

2:31 mins

29

What is Photoperiodism?

2:30 mins

30

Why is white matter white and gray matter gray?

2:07 mins

31

How do spectacles work?

3:12 mins

32

The Mongols

3:16 mins

33

How does our immune system work?

2:46 mins

34

What is Machine Learning?

2:47 mins

35

What does your metabolism say about you?

2:56 mins

36

What is the Renaissance?

3:23 mins

37

Is China erasing its borders with Hong Kong?

3:15 mins

38

The first Balkan War started today!

3:24 mins

39

The Indian Territorial Army

2:58 mins

40

The Outer Space Treaty

3:09 mins

41

What is Hydraulic Fracturing?

3:02 mins

42

What is the Industrial Revolution all about?

2:57 mins

43

What is Temperature Inversion?

3:27 mins

44

The Haitian Revolution

3:03 mins

45

The Pandyan Dynasty

2:55 mins

46

What is Imperialism?

2:01 mins

47

What is Nanotechnology?

3:11 mins

48

Why the League of Nations failed?

3:03 mins

49

The Geologic Time Scale

2:51 mins

50

How dangerous are Icebergs?

3:19 mins

51

What is Radioactive decay?

2:56 mins

52

What is Phototropism?

2:25 mins

53

What is Parasitic Nutrition?

3:23 mins

54

How do submarines work?

2:49 mins

55

How to prevent soil pollution?

2:36 mins

56

What caused the Asteroid Belt?

1:58 mins

57

What is the Hyperloop?

2:39 mins

58

What is a comet?

2:13 mins

59

The birth of a famous scientist.

2:29 mins

60

What is Adiabatic Lapse Rate?

2:37 mins

61

What are Karst Landforms?

3:10 mins

62

What is Ocean Acidification?

2:07 mins

63

The History of Paper.

2:17 mins

64

What are Exoplanets?

2:32 mins

65

Diploblasty vs. Triploblasty

1:51 mins

66

What is Big Data?

1:53 mins

67

What are Superconductors?

1:51 mins

68

What is a large Hadron Collider?

2:37 mins

69

Plasma in outer space.

3:02 mins

70

Importance of River Valleys to ancient civilizations

3:08 mins

71

The mysterious Iron Pillar, Delhi.

2:34 mins

72

What if the earth lost oxygen for 5 seconds?

3:17 mins

73

The Chernobyl Disaster

3:42 mins

74

The importance of conserving water

2:56 mins

75

What is Geomorphology?

2:39 mins

76

What does the Arctic Circle do?

2:46 mins

77

The death of a famous Indian nationalist

2:29 mins

78

World's most endangered mammal

2:38 mins

79

The birth of Rani Lakshmibai

3:00 mins

80

The last contacted people on earth.

2:13 mins

81

How human memory works?

3:30 mins

82

What is Earth's energy budget?

3:20 mins

83

What is carbon sequestration?

2:31 mins

84

Ancient trade routes that shaped World History.

5:12 mins

85

The Indian Space Research Organization

3:03 mins

86

The Constitution of India was adopted today.

2:17 mins

87

The new definition of Kilogram

2:54 mins

88

What is Liquidity Crisis?

2:49 mins

89

Are the islands of New Zealand getting closer?

2:32 mins

90

What is an Aquifer?

3:44 mins

91

How do diamonds form?

3:32 mins

92

What are Marsquakes?

2:24 mins

93

Facts about underwater volcanoes.

2:38 mins

94

Is the ocean floor dissolving away?

2:33 mins

95

Does it rain on other planets too?

3:04 mins

96

Do we have a hidden 8th continent on Earth?

2:44 mins

97

How is Oil and Natural gas formed?

2:36 mins

98

Impact of Chemicals on Living Organisms

3:42 mins

99

Radioactive Pollution

3:31 mins

100

Does human body need minerals?

3:18 mins

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