The concave lens

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

Refraction of light in 'atmosphere' causes

  • eye damage
  • mirages
  • dizziness
  • blindness

The lenses used for short sighted are

  • convex
  • biconvex
  • concave
  • flat lenses

Light travels more quickly in

  • metals
  • warm air
  • cool air
  • metalloids

Each pair of objects is identified by

  • refractive index
  • nature
  • type
  • shape

More dense the object

  • less the light refracts
  • less the light reflects
  • more the light refracts
  • more the light reflects

The light in 'optical fiber' is

  • refracted
  • reflected
  • straightened
  • reflected totally internally

The refractive index of water is

  • 0.33
  • 0.5
  • 1.5
  • 1.33

If light enters any substance with refractive index, it is

  • perpendicular
  • at a certain angle
  • parallel
  • at critical angle

Thin flexible glass rods to transfer data from one region to another are known as

  • glass cables
  • reflection fibers
  • optical fibers
  • copper fibers

When light bends, it

  • causes tricks in the air
  • causes tricks on our eyes
  • causes tricks on our brain
  • damages our eyes

The concave lens is also known as

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

Screens of monitors and televisions are made by

  • red dots
  • red, yellow and green dots
  • red, green and blue dots
  • white dots

Filter absorbs

  • only primary colored lights
  • secondary colored lights
  • tertiary colored lights
  • all colors of white light

Mirages are more common in

  • rainforests
  • dry forests
  • deserts
  • highlands

We can see things because light

  • is absorbed by objects
  • enters our eyes
  • reflects from our eyes
  • is colorless

The number of red cells in an eye is

  • 320 million
  • 120 million
  • 220 million
  • 200 million
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