Light and Shadows

The white light splits up in 7 colours, which is called dispersion. Therefore, option (2) is correct.

Opaque things - Do not allow the light to pass through
Transparent objects - Transmit the light
Translucent objects - A part of light can pass
Wall - opaque, Glass - transparent and Tracing paper - translucent
Therefore, option (3) is correct.

The Moon doesn’t have its own light.

If we add seven colours of rainbow, and make them pass through a prism, they will deviate the white light.

Luminous bodies emit their own light, like the sun or stars. Non-luminous bodies (like the moon or earth) reflect light but don't produce it. Opaque bodies don't allow light through, and a shadow is the absence of light. Only 'luminous' correctly describes light-emitting objects.

Air is transparent and not translucent.

Pinhole camera is based on the rectilinear propagation of light, i.e. the property that light travels in straight lines.

Glass is transparent.

Luminous objects are those, which emit light of their own. Therefore option (2) is correct.

Plastic is translucent and not transparent.

Opaque object causes shadow when light falls on them.

The fact that light travels in a straight line accounts for the occurrence of Eclipses.

Image will be formed, which will be inverted and also will be turned upside down and also will be turned left to right. It is based on the property of rectilinear propagation of light.

When Earth comes between the sun and the moon, the shadow of the earth falls on the moon. No sunlight can reach to the moon. So, option (1) is correct.

Through the left, the 7 colours of rainbows are written as ROYGBIV, and the 3^rd colour to the left from blue is orange.

Moon is not a light source. It reflects light falling on it whereas the rest are sources of light.