Question

Choose the correct option.

• A. The shape of the moon changes everyday and the various shapes seen during a month are called phases of the moon.
• B. Moon has no light of its own. We see only that part of moon, which reflects light of the sun to us. The position of moon changes due to its revolution around earth and hence the portion of moon reflecting the light of sun to us.

Answer 1

Answer: (A), (B)

Moon has no light of its own. We see only that part of moon, which reflects light of the sun to us. The position of moon changes due to its revolution around earth and hence the portion of moon reflecting the light of sun to us.

The explanation for the correct answers:

Option A:

1. The changing form of the moon, commonly known as the moon's phases, is caused by changes in the area of the moon illuminated by the sun.
2. We see the moon because sunlight is reflected on us. The sun can only illuminate half of the moon at any given time.
3. Because of the moon's spherical shape, the other half does not get any sunlight. Different proportions of the semi-sphere-shaped lighted half of the moon face the Earth depending on the relative locations of the sun, moon, and Earth, causing the formation of the moon seen from the Earth to change.
4. The Earth is squarely between the moon and the sun on a full moon day when the moon appears as a complete circle. As a result, the lit surface of the moon entirely faces the Earth, giving the moon the appearance of being spherical.
5. On the other hand, the Earth is positioned distant from the direct connection between the sun and the moon. The moon's luminous region, oriented towards and visible from Earth, becomes smaller as one moves away from this line.
6. On a new moon day, the Earth is the furthest away from the line connecting the sun and moon. As a result, the moon is only observable as a tiny crescent.

Option B:

1. Unlike a lamp or our sun, the moon does not generate its own light.
2. Moonlight is sunlight that reflects off the moon. The light bounces off the moon's surface's old volcanoes, craters, and lava flows.
3. The moon orbits the Earth once every $29.5$ days and is illuminated from various angles by the sun.
4. The moon seems brightest to us when it is $180\mathrm{degrees}$ away from the sun.

Therefore, both the options are correct.