Phy - Light Flashcards
1
Q
What is a lenses ?
A
Lens is a piece of transparent glass bound by two spherical
2
Q
What are the two types of lens ?
A
- Convex
2. Concave
3
Q
What is a convex lens ?
A
A convex lens is a lens that is thicker in the middle than at the edges
4
Q
What is concave lens ?
A
Concave lens is a lens which is thicker at the edges than at the middle
5
Q
Concave lens has what type of focus ?
A
It has a virtual focus
6
Q
How are images formed ?
A
Images are formed when light rays coming for the object pass through the lens
7
Q
What are the three images formed by the concave
lens ?
A
- virtual
- erect
- smaller than the object
8
Q
Who discovered that a glass prism with white light contained seven colors ?
A
Newton
9
Q
What does sunlight consist of ?
A
It consist of the seven colors
