Choose the transparent, translucent and opaque materials from the following :
Tracing paper, Cardboard, Ground-glass, Clear glass, Water, Air, Brick wall, Aluminium sheet.
Important Questions on Light, Shadows, and Reflections
State any two observations from everyday life which show that light travels in straight lines.
State two differences in the pinhole camera images and shadows.
We can see the sun because it is glowing. How are we able to see the moon ?
What is a periscope? How many plane mirrors are there in a periscope?
How are the two plane mirrors in a periscope arranged with respect to one another ?
How are the two plane mirrors in a periscope arranged with respect to the ends of the tube ?
What type of images (real or virtual) are formed :
(a) in a plane mirror?
(b) on a cinema screen?
(c) in a lake?
(d) in a pinhole camera?
Explain why, we often see bright circular patches of light on the ground under a tree on a sunny day.
