List any five properties of light.

थोडक्यात 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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पाठ 2: Optics - Evaluation [पृष्ठ ३०]

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

Fill in the blank

A medium through which light cannot pass is called the ....................

Match the following columns

Column A	Column B
a. Wooden block	i. new moon's day
b. Sun	ii. rectilinear propagation of light
c. Umbra	iii. opaque body
d. Eclipse	iv. luminous body
e. Solar eclipse	v. complete dark park

What is light? Define it.

Fill in the blank

There are ........... and man-made ............ of light.

Write true or false

The moon has its own light.

_______ is the natural source that stimulates sight and makes things visible.

Light is a form of ______.

When a beam of white light passes through a prism it gets ______.

State Rayleigh’s law of scattering.

Look at the figure given in the following figure.

Will there be any difference in the shadow formed on the screen in A and B.