Question

For std-3
answer in brief. (shortly)
a) define 'source of light'.
b) define' luminous objects'.
c) what do we mean by rays?
d) give two examples of opaque objects.
e) how does a shadow form? ​

Answer 1

Answer:

aLight sources for exhibition design | Part 3 – LED and electroluminescent lamps, fiber-optic systems

LED – Light-emitting diodes. LEDs are currently experiencing a huge success in exhibition lighting. ...

Fiber Optic lighting systems. ...

Electroluminescent / Light Emitting Capacitor.

bThe luminous objects are visible as they emit light on their own.

c each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.

d human and animal etc

e If the object they hit is opaque, the light cannot pass through, and a shadow forms. Simply speaking, a shadow is an absence of light. If light cannot get through an object, the surface on the other side of that object (for example, the ground or a wall) will have less light reaching it.

Explanation:

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