What occurs when the tip of the umbra falls on the earth?
Partial solar eclipse
Partial lunar eclipse
Annular solar eclipse
None of these
A glowing electric bulb is an example for:
Point source of light
Extended source of light
Ray of light
When the earth comes in between the sun and moon, the eclipse formed is:
Solar eclipse
Lunar eclipse
Radius of curvature, r =
f/2
2f
2/3 f
f
A solar eclipse occur only on a:
New moon day
Full moon day
Gibbous moon
