Light (Part -1)

• Rainbows always form on the opposite side of the Sun. There is a red color on the top edge of the rainbow and a purple color on the bottom edge.

Key Points about Alpenglow:

1. Cause: It occurs due to the scattering of sunlight by the atmosphere when the sun is just below the horizon. The sunlight is indirectly reflected or scattered by the atmosphere and clouds, illuminating the mountains with a soft reddish light.

2. Appearance: The glow typically has warm hues — pink, red, or orange — highlighting the peaks in a beautiful, diffuse light.

3. Difference from Direct Sunlight: Unlike direct sunlight, alpenglow happens without the sun being visible, giving mountains a magical glow during twilight hours.

Orange is not the primary color but it is a secondary color among the colors given in the options.

Primary colors are

• Red,
• Yellow,
• and Blue (RYB).

Secondary colors are

• Green,
• Orange,
• and Violet (GOV).

• To correct this defect, a concave lens is used in the glasses of the person.
• Whereas a convex lens is used in a person's glasses to correct far-sightedness.

• To correct this defect, a concave lens is used in the glasses of the person.
• Whereas a convex lens is used in a person's glasses to correct far-sightedness.

• Light rays coming from near are diffused.
• Therefore, a convex lens is used to focus them on the retina.

• A convex lens concentrates the light rays at a single point.

• The reason for the occurrence of farsightedness is the focal length of the eye lens-enlargement or shortening of the eyeball.

Hence statement (d) is wrong.

• It's a natural, often annoying part of ageing.
• Presbyopia usually becomes noticeable in your early to mid-40s and continues to worsen until around age 65.
• Bifocal lenses are used to correct this defect.