List any five properties of light.

संक्षेप में उत्तर

Light is a form of energy.
Light always travels along a straight line.
Light does not need any medium for its propagation. It can even travel through a vacuum.
The speed of light in a vacuum or air is c = 3 × 10⁸ ms^-1.
Since light is in the form of waves, it is characterized by a wavelength (k) and a frequency (v), which are related by the following equation: c = v λ (c – velocity of light).
Different coloured light has different wavelength and frequency.
Among the visible light, violet light has the lowest wavelength and red light has the highest wavelength.
When light is incident on the interface between two media, it is partly reflected and partly refracted.

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अध्याय 2: Optics - Evaluation [पृष्ठ ३०]

अध्याय 2 Optics
Evaluation | Q VII. 1. | पृष्ठ ३०

Match the following

(a). A light ray passes from air to glass	(1) . speeds up
(b). A light ray passes from glass to water	(2). reflects red light
(c). Virtual image	(3). primary colours
(d). Red rose	(4). plane mirror
(e). Red, green, and blue	(5). slows down

Can light travel in vacuum?

Write true or false of the following statement.

The moon is self-luminous.

Explain the difference between a transparent, a translucent, and an opaque medium. Give two examples of each.

Write true or false

The stars have no light.

Answer the following.

Distinguish between transparent, translucent, and opaque objects.

When a ______ object comes in the way of light, light passes ______ it.

In going from a rarer to denser medium, the ray of light bends ______.

What is light?

Light is a form of energy and it travels in a straight line.