Vertical lines
Zigzag lines
Perpendicular lines
Straight lines
Speed of light is approximately ----------- kilometers per second.
With respect to light, materials have been divided into:
Materials which do not allow the light to pass through them are called:
Transparent materials make no ---------- when placed in the path of light.
Light is able to pass partially through:
Opaque materials
Translucent materials
Liquid materials
Transparent materials
A Solar eclipse occurs when the moon comes in between the Sun and:
------------ Occurs when the Earth moves in between the Sun and the Moon.
Lunar eclipse
Sun eclipse
When the fight falls on a cricket bat. a shadow is formed because the bat is:
In a candle, ------------ energy is changed into light energy.
How long after an explosion on the Moon would we first see its light on Earth?
About 1/10 sec
About 1 sec
Select one from the following which do not emit light:
Select one from the following which emits light:
The Sun is approximately -------------- million kilometers away from die Earth.
Light from the Sun reaches the Earth in about:
