LIGHT

The darkest part of a shadow is
1. umbra
2. penumbra
3. eclipse
4. shadow
The lighter shade of shadow is
1. umbra
2. penumbra
3. eclipse
4. shadow
What is the incident which occurs when any astronomical object is partially or fully obscured due to placement of another astronomical object in the presence of light?
1. Eclipse
2. Umbra
3. Penumbra
4. Shadow
What is the eclipse in which moon arrives between the sun and the earth?
1. Lunar eclipse
2. Solar eclipse
What is the eclipse in which earth arrives between the sun and the moon
1. Lunar eclipse
2. Solar eclipse
Which works on principle of total internal reflection?
1. Newton disk
2. Prism
3. Optical fibre
Reflection in smooth surface is
1. specular reflection
2. diffused reflection
Reflection in rough surface is
1. specular reflection
2. diffused reflection
The ray of light that falls on the surface of the reflection is
1. normal
2. reflected ray
3. incident ray
The ray of light that comes from the pointwhen the incident ray falls on the reflection material is
1. normal
2. reflected ray
3. incident ray