Radius of curvature, r =
f/2
2f
2/3 f
f
Rays of light always travel in a straight line.This phenomenon is called:
Total internal reflection
Rectilinear propagation
Scattering of light
None of these
When the earth comes in between the sun and moon, the eclipse formed is:
Solar eclipse
Lunar eclipse
Partial lunar eclipse
A glowing electric bulb is an example for:
Point source of light
Extended source of light
Ray of light
What occurs when the tip of the umbra falls on the earth?
Partial solar eclipse
Annular solar eclipse
