Tag: images in plane mirror

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Questions Related to images in plane mirror

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

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 

  1. $10\ cm$
  2. $15\ cm$
  3. $20\ cm$
  4. $25\ cm$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To complete a vertical circle of radius r at the bottom of an inclined plane, the minimum velocity needed at the bottom is v = sqrt(5gr). Using conservation of mechanical energy, potential energy mgh at the top of the incline converts entirely to kinetic energy at the bottom, so mgh = (1/2)mv^2 = (5/2)mgr, giving h = 2.5r = 25 cm.

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

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

  1. $0^o$
  2. $30^o$
  3. $60^o$
  4. $90^o$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When light passes from one medium to another, it only continues in a straight line without refraction if the angle of incidence is 0 degrees (normal incidence).

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

While is not basic transformation function 

  1. Translation

  2. Rotating

  3. Scaling

  4. Reflection
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A transformation is when you take a shape and you move it in some way. A basic rigid transformation is a movement of the shape that does not affect the size of the shape. The shape doesn't shrink or get larger. There are three basic rigid transformations: reflections, rotations, and translations. So, scaing is not a basic transformation function.

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

A ray of light is incident on a plane mirror along a vector $\hat i+\hat j-\hat k$. The noemal on incident point is along $\hat i+\hat j$. Then unit vector along the reflected ray is:

  1. $ \dfrac { 1 }{ \sqrt { 3 } } \left( \hat { i } +\hat { j } +\hat { k } \right)$
  2. $-\dfrac { 1 }{ \sqrt { 3 } } \left( \hat { i } +\hat { j } +\hat { k } \right)$
  3. $ \dfrac { 1 }{ \sqrt { 3 } } \left( -\hat { i } -\hat { j } +\hat { k } \right)$
  4. $ \dfrac { 1 }{ \sqrt { 3 } } \left( -\hat { i } +\hat { j } +\hat { k }\right)$
Reveal answer Fill a bubble to check yourself
B Correct answer