Tag: nature and sources of light

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Questions Related to nature and sources of light

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

If a plane mirror makes an angle of ${120^0}$ with x-axis, then  a ray of light, incident on it along x-axis, after reflectionmay pass through point.

  1. (1,1)
  2. $\left( {1,\sqrt 3 } \right)$

  3. (3,1)

  4. (1,2)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mirror is at 120 degrees to the x-axis. A ray along the x-axis hits the mirror at an angle of 60 degrees relative to the normal. By reflection laws, the reflected ray makes an angle of 120 degrees with the x-axis. The line equation is y = -sqrt(3)x + c. Testing the point (1, sqrt(3)) fits the geometric path.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

We can see the objects only when:

  1. reflected light from the objects reaches our eyes

  2. the objects absorb all the light

  3. when the objects allow all the light to pass through them

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Objects can pnly be seen when light falls onto the object and is reflected back to our eyes to form an image on the retina.