Tag: physics

Questions Related to physics

According to the laws of reflection, angle of incidence is equal to angle of reflection.

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. True

  2. False

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Correct Option: A
Explanation:

According to the laws of reflection, the angle of incidence made by the incident ray with the normal must be equal to the angle of reflection made by the reflected ray with the normal i.e.  $i=r$. So, the given statement is true.

The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ___________.

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Reflection

  2. Refraction

  3. Dispersion

  4. None

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Correct Option: A
Explanation:

Reflection is the phenomenon by which the incident light falling on a surface is sent back into the same medium.

Which objects use the reflection of light?

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Side mirror of a car

  2. Periscope

  3. Mirror

  4. All of the above

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Correct Option: D
Explanation:
Side mirror of a car is convex mirror which uses reflection of light.
Periscope uses two plane mirror for image formation.
And all mirrors use reflection of light to form image.

A light ray makes an angle of incidence $60^o$, when it falls on a plane reflecting sheet.
The angle of reflection will be.

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. $60^o$

  2. $30^o$

  3. $45^o$

  4. $90^o$

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Correct Option: A
Explanation:

According to laws of reflection angle of incidence is equal to angle of reflection, hence of $60^{0}$ angle of incidence, angle of reflection is also $60^{0}$.

Read the given statements and select the correct option.
Statement 1: When a ray of light passes from air into water, it will bent towards the normal.
Statement 2: When light travels from air into water, its speed increases.

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

  2. Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.

  3. Statement 1 is true but statement 2 is false.

  4. Statement 1 is false but statement 2 is true.

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Correct Option: C
Explanation:

When light travels from air Into water, Its speed decreases.

Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Unpolished wood, covered with white cloth

  2. Polished glass of red colour

  3. Glass covered with cellophane paper

  4. Smoked glass covered with green colour cloth.

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Correct Option: B
Explanation:

Polished glass of red colour reflects some of the light incident on it so images of the both persons are formed on it.

Reflection is

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Bending of ray of light.

  2. Bouncing back of ray of light.

  3. Light travelling in a straight line.

  4. None of these.

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Correct Option: B
Explanation:

Reflection is bouncing back of ray of light.  

The locus of a point which moves so that its distance from x-axis is double of its distance from y-axis is

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. $x = 2y$

  2. $y = 2x$

  3. $y = 2x + 3$

  4. $x = 5y + 1$

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Correct Option: B
Explanation:

The distance from x axis is equal to y and distance from y axis is equal to x.

So by given data, $y=2x$

A ball of $1\ g$ released down an inclined plane describes a circle of radius $10\ cm$ in the vertical plane on reaching the bottom. The minimum height of the inclined plane is 

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. $10\ cm$

  2. $15\ cm$

  3. $20\ cm$

  4. $25\ cm$

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Correct Option: A

If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incident must be _____

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. $0^o$

  2. $30^o$

  3. $60^o$

  4. $90^o$

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Correct Option: A