Tag: light and shadow

Questions Related to light and shadow

A thin layer of water is transparent but a very thick layer of water is

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. translucent

  2. opaque

  3. most transparent

  4. more transparent

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Correct Option: A
Explanation:

A thin layer of water is transparent but a thick layer of water is translucent as lateral shift depends on thickness of the object.

A body which allows most of the light to pass through it is called a

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. transparent body

  2. opaque body

  3. translucent body

  4. none of these

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Correct Option: A
Explanation:

A body which allows most of the light to pass through it is called a transparent body.

Air is not visible because it

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. is nearly perfectly transparent substance

  2. neither absorbs nor reflects light

  3. transmits whole of light

  4. all the above are correct

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Correct Option: D
Explanation:

Air is not visible because it is transparent medium. As from definition of transparent medium, their reflectance and emitance is zero , hence it transmits all the light.

Which of the following is a transparent?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Gold

  2. Glass

  3. Stone

  4. Plastic

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Correct Option: B
Explanation:

Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.

Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.

Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Glass is a $\bf{transparent} $ object because it allows light to pass through it completely and doesn't block any light. 
Gold and Stone, on the other hand, are $ \bf{opaque} $ objects. While, Plastic is $ \bf{translucent} $.

Hence, the correct answer is OPTION B. 

A cyan colour light ray is passed through a blue filter. What is the colour of the light which comes out through the filter?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Green

  2. Cyan

  3. Yellow

  4. Blue

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Correct Option: D
Explanation:

The color of light coming through a filter is specific to the filter.for example blue filter will allow only blue rays to pass through it.

What is the colour of a green leaf, when white light passing through a yellow filter is incident on it?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Black

  2. Blue

  3. Yellow

  4. Green

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Correct Option: D
Explanation:

Color of an object visible to us is independent of the color of light incident on it. Hence a green leaf will look green even if yellow light is incident on it.

A body which allows almost all the light to pass through it and does not reflect any light is a-

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. transparent body

  2. opaque body

  3. translucent body

  4. polished surface

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Correct Option: A
Explanation:

Objects which allow the light to pass through them completely without any obstruction or reflection are called $ \bf{transparent} $ objects.

Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.

Polished surfaces are good reflectors of light and do not allow light to pass through it. 

Hence, the correct answer is OPTION A.

A medium which partially allows the light rays to pass through it is called -

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. transparent

  2. opaque

  3. non-luminous

  4. translucent

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Correct Option: D
Explanation:
Objects or medium which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects or medium.

Objects or medium which do not allow the light to pass through them are called $\bf{opaque} $ objects or medium.

Objects which do not emit light on their own are called  $ \bf{non-luminous} $ objects.

Objects or medium which allow the light to pass through them partially are called $ \bf{translucent} $ objects or medium.

Hence, the correct answer is OPTION D. 

Glass allows light to pass through it because it is -

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. transparent

  2. opaque

  3. luminous

  4. non-luminous

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Correct Option: A
Explanation:

Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.

Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Objects that give out or emit light of their own are called as $ \bf{luminous} $ objects.

Objects which do not emit light on their own are called $ \bf{non-luminous}$ objects.

Thus, glass allows light to pass through it because it is transparent and doesn't block any light. 

Hence, the correct answer is OPTION A.  

Cellophane paper is an example of -

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. an opaque object

  2. a translucent object

  3. a transparent object

  4. a luminous object

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Correct Option: C
Explanation:
Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.

Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.

Objects that give out or emit light of their own are called as $ \bf{luminous} $ objects.

Since, cellophane paper allows light to pass through it completely, it is a transparent object. Also, it doesn't emit any light. 

Hence, the correct answer is OPTION C.