__________ occurs when the tip of the umbra falls on the Earth.
Partial solar eclipse
Partial lunar eclipse
Annular solar eclipse
None of these
Choose the correct answer
The Earth takes ________ to complete one rotation.
365 days
24 hours
6 month
3 month
Spectacle glass is _________.
Opaque object
Transparent object
Translucent object
Partially transparent object
Rays of light travel in a straight line.This phenomenon is called
total internal reflection
rectilinear propagation
scattering of light
none of these
