Tag: light, shadows and images

An object is visible to us only if light reflected or emitted by it reaches our eye and image is formed at retina.

The intensity of the light is decreased because no surface is perfectly reflecting surface. When the light is incident on a reflecting surface some part of the light is observed, resulting in decrease in the intensity.

False

Objects that give out or emit light of their own are called as $ \bf{luminous\ objects} $. 
Objects which do not emit light on their own are called  $ \bf{non-luminous} $ objects.

Sun is a luminous object because it a source of light and consequently emits light of it's own.
Moon is a non-luminous object because it does not emits it's own light and glows by reflecting the light of the sun.

Hence, the correct answer is OPTION C. 

Luminous objects can be defined as objects which emit their own light by use of some reactions or energy source.

Objects which do not emit light on their own are called  $ \bf{non-luminous} $ objects.
Objects that give out or emit light of their own are called as $ \bf{luminous\ objects} $.

Moon is a non-luminous object because it does not emits it's own light and glows by reflecting the light of the sun.
Sun, Bulb and candle give out or emit their own light and hence, are luminous objects.

Hence, the correct answer is OPTION B.

Objects which do not emit light on their own are called  $ \bf{non-luminous} $ objects.
Objects that give out or emit light of their own are called as $ \bf{luminous\ objects} $.

Sun is a source of light and thus, gives out or emits light of it's own and hence, is a luminous object.

Non-luminous objects reflect the light falling on them and the reflected light are sensed by the eye and thus we are able to see non-luminous objects.

Translucent objects allow only a small part of light to pass through them.

A coloured plastic bottle is an opaque material. When a light beam is incident on it, a shadow will form on the screen. Light can easily pass through the transparent material.