Ch-16 Light

Q1) The light ray, which strikes any surface, is called the _________,

The ray that comes back from the surface after reflection is known as the_________.

• Reflected Ray, Incident Ray

• Incident Ray,

  Reflected Ray

• Reflected Ray,

  Reflected Ray

• Incident Ray,

  Incident Ray

Answer explanation

A ray of light is an idealisation. In reality, we have a narrow beam of light which is made up of several rays. For simplicity, we use the term ray for a narrow beam of light.

Tags

Types of Rays

Q2) Angle of Incidence is always ______ the Angle of Reflection.

• <

• >

• =

• None of these

Answer explanation

<i = <r

👆🏻

This is one of the law of reflection.

Tags

<i and <r

Q3) The incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane.

• TRUE

• FALSE

Answer explanation

This is the 2nd law of reflection.

Tags

Same Plane

Q4) Reflection from a smooth surface like that of a mirror is called __________

• Regular Reflection

• Diffuse Reflection

• Both a and b

• None of these

Tags

Regular and Diffuse Reflection

Q5) Boojho has 1 question - Can the reflected rays be further reflected if incident on another mirror? If yes, then what it is called ?

• 2 reflections

• Deviation

• Refraction

• Multiple Reflections

Answer explanation

This idea of number of images formed by mirrors placed at an angle to one another is used in a kaleidoscope to make numerous beautiful patterns.

Tags

Multiple Reflection

Q6) How many mirrors are placed inside a kaleidoscope ?

What kind of shape are the mirrors ?

• 3, square

• 2, rectangular

• 3, rectangular

• 2, square

Answer explanation

This is a view inside a kaleidoscope.

Tags

Kaleidoscope

Q7) Bending of light into its colour is known as Dispersion Of Light.

• TRUE

• FALSE

Answer explanation

Splitting of light into its 7 colours namely VIBGYOR is known as DISPERSION OF LIGHT.

Tags

Dispersion

Q8) NAME THE PARTS OF HUMAN EYE PRESENT IN THE PICTURE.

• 1-Ciliary Muscle

  2-Iris

  3-Lens

  4-Cornea

  5-Retina

  6-Optic Nerve

• 1-Retina

  2-Iris

  3-Lens

  4-Cornea

  5-Ciliary Muscle

  6-Optic Nerve

• 1-Retina

  2-Iris

  3-Optic Nerve

  4-Cornea

  5-Ciliary Muscle

  6-Lens

• None of the above

Answer explanation

This is the HUMAN EYE diagram.

Tags

Human Eye

Q9) Read the following paragraph and answer the following question :

Behind the cornea, we find a dark muscular structure called iris. In the iris, there is a small opening called the pupil. The size of the pupil is controlled by the iris. The iris is that part of eye which gives it its distinctive color.

Which part of the eye controls the amount of light entering into the eye?

• Pupil

• Cornea

• Iris

• Retina

Tags

Part of Eye

Q10) Read the following paragraoh and answer the question that follows:

The retina contains several nerve cells. Sensations felt by the nerve cells are then transmitted to the brain through the optic nerve. There are two kinds of cells; cones & rodes.

a) Rodes are sensitive to _______

b) Cones are sensitive to _______

c) Cones can sense ___________

• a) Dim Light

  b) Bright Light

  c) Color

• a) Dim Light

  b) Color

  c) Dim Light

• a) Bright Light

  b) Dim Light

  c) Color

• None of the above

Tags

Cones & Rodes