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The incident ray on the surface of separation CD is QR.

From glass to air  - Greater

The critical angle of glass is 42°.

Angle of refraction to becomes 90°.

The angle of refraction greater is lower than the angle of incidence when it goes from air to glass.

Will be a constant.

If the angle of refraction with the increase in the angle of incidence when a ray enters a medium will Increases.

Local winds are winds whose effects are limited to a comparatively it is formed as a result of local pressure differences. Such winds exist in different parts of the world. Loo, Mango Showers and Kalbaisathi are the local winds experienced in India. Chinook, Harmattan and Foehn are some of the local winds in other parts of the world.

The ray is reflected back to the same medium without undergoing refraction.

No, refraction take place for a ray while entering a glass slab normal to it.

Correct option is D) bottle

Yes, There a change in the height of the image.

Height of the image = (h_i ) = -4 cm 

Height of the object = (h₀ ) = +1 cm

Magnification = \(\cfrac{h_i}{h_0}\) = \(\cfrac{-4}{+1}\) = -4

or in another way

m = v/4

v = +100, u = -25

m = \(\cfrac{100}{-25}\) = -4

As water throws out of the opening observe the case beam remains trapped in the water stream because of total internal reflection. As light tries to pass from the more dense water to the less dense air. it bends. In narrow column of water, the light wave continues bouncing off the boundaries of the stream of water but cannot pass through into the air.

Chinook is a local wind that blows down the eastern slope of the Rocky mountains in North America. As a result of these winds, the snow along the eastern slopes of the Rocks melts. This wind reduces the severity of the cold, it is helpful for the wheat cultivation in the Canadian lowlands.

P = 1/f = 1/2 = 0.5 dioptre

Power decreases

Foehn is the wind that blows towards the southern valleys of the Alps. As the air heats up due to pressure from the descend, it helps in reducing the severity of cold in that’ region.

f = + 25 cm = +25/100 = +0.25 m

p = I/f = 1/+0.25 = +4 D

Loo is the hot Local wind which blows from the Rajastan desert.

In this case, refracted Ray do not actually intersect to each other. It appears to intersect the images formed the same side of the lens.

Correct answer is (B) 2.0 cm

p = + 2D

It is a convex lens

f = 1/p = 1/2 = 0.50 m = 50 cm

Harmattan is a day wind which blows from the Sahara desert towards the West Africa. On of the arrival of these winds, the humied and sultry conditions of west Africa is improved significantly. Hence people call these winds as doctor Harmattan.

For a healthy vision, the distance is 25 cm to the near point.

No. It will not be possible to see a clear image.

1. +1.5 D, -2D indicates the power of lens they required. The power of a lens is defined as the ability of the lens to converge or diverge a beam of light falling on it.

2. The power of a convex lens is positive while the power of a concave lens is negative. +1.5D represents convex lens.

-2D represents concave lens.

Yes. A clear image will be formed.

This can be rectified by using a convex lens of suitable power.

Loo:

• Not wind blowing in the North Indian plain.
• Hot wind blows is hot dry season. 
• It increases the summer temperature. 
• It is experienced in the afternoon.

Mango Showers:

• It blows in South India during hot season.
• It acquires its name owing to the fall of ripe mangoes on its arrival.

1. Size larger

2. Power low

a. Monsoon wind: South west monsoon wind. 

b. During summer season of Northern Hemisphere. 

c. Low pressure is formed over Indian subcontinent due to the intense day temperature. The Indian Ocean regions remain as high pressure during this time. So these winds blow from the Indian Ocean to Indian subcontinent.

d. South west monsoon winds blow from sea to land. The difference in pressure over land and sea is the reason.

Green + Red = Yellow

Distance to the near point of a healthy person is 25cm.

The deviation of those rays having lesser wavelength compared to those rays having higher wavelength is less.

Correct answer is: b. Refraction

The picture indicates Coriolis Force. Freely moving bodies get deflected to the right in the northern hemisphere and to the left in the southern hemisphere due to a force generated as a result of earth’s rotation. This is known as the Coriolis Force. This force increases as it moves towards the poles from the Equator. Admiral Ferrell found out that the winds in the northern hemisphere deflect towards their right and those in the southern hemisphere deflect towards their left due to the Coriolis effect. The law put forward by him on the basis of this known as Ferrell’s Law.

If a concave mirror is used as a rearview mirror of a vehicle as a concave mirror produces the completely inverted image of the real image to be produced. When we use a concave mirror the image of the distant object gets inverted so it is not physically possible to use them.

The rate of refraction for different col-ours during dispersion is different due to the difference in wavelength of the colours. The rate of refraction decreases with increase in wavelength. Dispersion. is the phenomenon of splitting of light into its component colours.

Name the phenomenon is: Refraction

a. Green 

b. When blue filter paper is used, no light will fall on the screen. The yellow, green and red colours coming out of the yellow filter will not pass through blue filter paper.

Light can reach the telescope which is kept in space without scattering as there are no gases and tiny particles in space. So we can observe the heavenly bodies clearly there. The pictures may not be clear on earth due to the scattering of light.

Blue colour spreads first in the solution when acid was added.

a. Persistence of Vision. 

b. When an object is viewed by a person, the image remains in the retina for a time interval of 1/16 second. This phenomenon is called persistence of vision. 

c. Raindrops look like glass rods during rain.

Violet, indigo, blue, green, yellow, Orange, Red.

a. White colour

b. Persistence of vision. When a person views an object, its image remains in the retina of the eye for a time interval of 0.0625 s 

c. If the disc is rotated slowly it is easy to identify the different colours.

d. Due to the Persistence of vision.

Violet → indigo

blue → green → yellow

orange → red

Blue has the maximum scattering