Physics
We do not get a shadow when
- there is an opaque object
- there is no light
- there is a light source
- there is a translucent object
Light Energy
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Answer
there is no light
Reason — A shadow is formed when an opaque object blocks light from a source. However, if there is no light, there is nothing to block and hence, no shadow is formed. Light is essential for the formation of shadows.
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Related Questions
Grease paper is an example of …………… object.
- translucent
- transparent
- opaque
- all of these
The shadow of an object does not show :
- the outline of the object
- the colour of the object
- the shape of the object
- none of these
Fill in the blanks :
(a) Light gives us the sensation of …………… .
(b) The sun is a …………… source of light.
(c) A medium through which light cannot pass is called the …………… .
(d) A medium which allows light to pass through it easily is called the …………… .
(e) Moon is a …………… body.
(f) Light travels in a …………… path.
(g) In a pin hole camera, the image formed is …………… .
(h) The darkest portion of a shadow is called the …………… .
(i) The less dark portion of a shadow is called the …………… .
(j) Lunar eclipse occurs when the …………… comes in between the …………… and the sun.
Write true or false for each statement :
(a) The moon is a natural source of light.
(b) The moon is self luminous.
(c) We can see an object through an opaque medium.
(d) Light passes through glass.
(e) Light travels in a straight line path.
(f) Image formed in a pin hole camera is real.
(g) The image in a pin hole camera gets blurred if the hole is made bigger.
(h) A shadow is formed because light travels in a straight line path.
(i) Solar eclipse occurs when the sun comes in between the earth and the moon.
(j) If the shadow of earth falls on the moon, the eclipse is called lunar eclipse.