The colors known as primary colors are

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

Scientist proved that it is possible to

  • split dispersed lights further
  • merge lights to form a white light again
  • emerge lights to form more colors
  • to combine random lights to form colors

The angle of incidence when it meets the next boundary while leaving the object, is

  • greater than zero
  • equal to zero
  • less than zero
  • perpendicular to the surface of object

Televisions and monitors use the effect of

  • primary colors
  • secondary colors
  • tertiary colors
  • special color

The reflection of light back to the medium again and again, is known as

  • internal reflection
  • critical reflection
  • total internal reflection
  • total critical reflection

If a ray of light enters water at an angle of 40 degree, it will be

  • refracted
  • reflected
  • internally reflected
  • distributed

The number of types of cells in retina is

  • 2
  • 3
  • 4
  • 6

If light enters a glass, it slows down more than

  • 200,000 km/s
  • 150,000 km/s
  • 100,000 km/s
  • 50,000 km/s

When light enters a dense medium, it leaves the object from

  • the same point
  • a different point
  • the far end
  • the close end

Light bends in all materials at

  • same angle
  • different angles
  • nearly same angles
  • opposite angles

Refractive index of diamond is

  • 2
  • 2.5
  • 2.42
  • 2.65

The color of one part of spectrum is

  • brown
  • cyan
  • indigo
  • magenta

The angle between the normal ray and the ray leaving a medium is known as

  • critical angle
  • angle of incidence
  • angle of reflection
  • angle of refraction

Filters do not

  • change the light
  • change the color
  • change the primary colors
  • change the secondary colors

Rods are sensitive to

  • bright light
  • dim light
  • colored Vision
  • blurriness

If light enters a dense object in angle of zero, it would

  • bend
  • reflect back
  • go straight
  • turn towards right

Leaf looks green because it absorbs

  • all colors except green
  • green color and reflects others
  • red and yellow color
  • blue and yellow color

To enable you to see a rainbow the sun should be positioned

  • in front of you
  • behind you
  • on your left side
  • on your right side

Night blindness is caused due to

  • lack of rods
  • over numbering of cones
  • problem in cones
  • problem in rods

The angle which is formed between normal ray and the ray entering a medium is known as

  • critical angle
  • angle of incidence
  • angle of reflection
  • angle of refraction

Focal point is the point where

  • light spread out quickly
  • light rays meet
  • lens can magnify the most
  • dispersion of light occurs

Waves on top of spectrum are

  • infrared waves
  • gamma rays
  • x-rays
  • ultraviolet rays

If the angle of incidence at the far-edge is too large, the light would

  • escape
  • not escape
  • end in the object
  • spread into seven colors

We cannot see through

  • transparent objects
  • opaque objects
  • luminous objects
  • non luminous objects

The convex lens

  • shrinks the image
  • magnifies the image
  • sharpens the image
  • increases the contrast of the image

Non luminous objects are colored by the process of

  • color addition
  • color subtraction
  • color multiplication
  • color division

The dispersion can be noticed by passing a white light through

  • glass
  • mirror
  • water
  • prism

'Refractive index' is equal to

  • speed of light in material /speed of light in vacuum
  • speed of light in material/speed of light in air
  • speed of light in vacuum/speed of light in material
  • speed of light in vacuum/speed of light in air

Names of the types of lenses are

  • convex and biconvex
  • concave and biconcave
  • biconvex and biconcave
  • convex and concave

Light in extremely denser medium is

  • reflected back again and again
  • refracted again and again
  • refracted at reflex angle
  • finally finishes
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