When a beam of white light is refracted, it spreads into

  • five colors
  • six colors
  • seven colors
  • nine colors

A 'green filter' would

  • allow only green color to pass
  • allow red and blue to pass
  • allow green color and its components to pass
  • allow all colors except green

We see yellow color on the screen because

  • red and blue dots shine more than green dots
  • green and red dots shine more than blue dots
  • green and blue dots shine more than red dots
  • dots shine at the same rate

For refraction of light, the angle of incidence must be

  • equal to zero
  • less than zero
  • greater than zero
  • less than or greater than zero

Tiny rain droplets act like a

  • glass
  • mirror
  • prism
  • drop of oil

The critical angle for water is

  • 36 degree
  • 42 degree
  • 48 degree
  • 54 degree

The refractive index of soda-lime glass is

  • 0.5
  • 1
  • 1.5
  • 2

The colors on the disk are mixed

  • by our eyes
  • due to fast rotations
  • due to humidity
  • due to pressure

In concave lenses, a distant object appears

  • upright
  • virtual
  • magnified
  • inverted

A red "filter"

  • allows green and blue color to pass
  • allows red color to pass
  • allows all colors to pass except red
  • allows yellow color to pass

As the light moves from one medium to another, its

  • amplitude changes
  • speed changes
  • frequency and wavelength change
  • wavelength changes only

An example of 'refraction' of light is

  • water
  • wall
  • brick
  • metal

To form other colors like brown, peach, purple etc. the colors that are required, are

  • red, yellow and green
  • red, blue and orange
  • green, blue and yellow
  • red, green and blue

If an object is extremely dense, light

  • passes through it
  • never passes through it
  • leaves it at once
  • never leaves it

An example of a device in which convex lens is used, is

  • mirror
  • telescope
  • spectacles
  • contact lenses

The disk spun on rainbow to join its seven colors in order to make the effect of white light is known as

  • Rainbow disk
  • Newton disk
  • Newton's color disk
  • Rainbow color disk

Light travels fastest through

  • vacuum
  • air
  • solids
  • liquids

Cones are also sensitive to

  • secondary colors
  • tertiary colors
  • mixed colors
  • primary colors

'Refractive index' of ice is

  • 0.5
  • 1.5
  • 1.33
  • 1.31

The light that has passed through a filter, is always

  • dim
  • bright
  • sharp
  • blur

A red car looks red because it

  • reflects all colors except red
  • absorbs all colors except green and blue
  • absorbs all colors except indigo
  • reflects red color and absorbs others

'Refractive index' of silicon is

  • 2.34
  • 3.22
  • 4.01
  • 4.02

Who applied the word 'spectrum' to describe the rainbow of colors that combine to form white light?

  • Isaac Newton
  • Joseph Von Fraunhofer
  • Michael Faraday
  • Georg von Reichenbach

If red, green and blue are mixed together, the formed color of light will be

  • blue
  • violet
  • indigo
  • white

Like sound, light travels as a

  • wave
  • heat
  • radiation
  • volume

The scientist who presented the theory of dispersion of light was

  • French
  • English
  • Chinese
  • Spanish

The dispersion of white light into seven different colors is known as

  • dispersion
  • spectrum
  • prism
  • multi light bands

The index that identifies each object is known as

  • rare active index
  • refractive index
  • reflective index
  • bending index

The convex lens is also known as

  • converging lens
  • diverging lens
  • dispersing lens
  • conducting lens

Light is refracted in air. It enters our eyes through different angle this is why

  • dizziness occurs
  • mirages appear
  • close objects move far
  • far objects seem closer
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