The light which is refracted the least, is

  • violet light
  • red light
  • blue light
  • orange light

Some objects look white in color like snow because they

  • reflect all colors
  • absorb all colors
  • refract all colors
  • absorb white color

The change in speed of light when entering water is

  • 5,000 km/s
  • 50,000 km/s
  • 100,000 km/s
  • 200,000 km/s

White light is a mixture of

  • seven colors
  • nine colors
  • fourteen colors
  • fifteen colors

The refractive index assumes the entrance of light from

  • glass
  • water
  • vacuum
  • gas

Inside rain droplet, light

  • is refracted twice
  • is refracted thrice
  • is reflected once
  • is reflected twice

The lens in a human eye is

  • convex
  • concave
  • biconcave
  • biconvex

If the angle of incidence of light while leaving the denser object is zero, the light would

  • be reflected back
  • go straight without any refraction
  • be refracted
  • end up at the boundary of the object

When light enters a less dense medium, it bends

  • away from the normal path
  • towards the normal path
  • away from the plane
  • towards the plane

The rods are mostly found

  • in the center of retina
  • at the blind spot
  • at the edges of retina
  • above and below retina

The color blindness occurs due to

  • lack of rods
  • problem in rods
  • problem in cones
  • variation in cones

Things that give off light are known as

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

Periscope is used in submarines to see the happenings of events

  • above sea level
  • on sea level
  • in algae abundant ares
  • behind a wall or a barrier

When red and blue are combined together, they form

  • yellow
  • magenta
  • orange
  • purple

A magenta filter absorbs

  • all colors except red
  • all colors except magenta
  • magenta only
  • magenta and its components

Most of the objects we see

  • produce colors
  • produce lights
  • do not produce lights
  • do not produce colors

A colored film that fits over a lamp or camera to change the color of the light passing through it, is known as

  • effecter
  • film
  • filter
  • effect

The refraction of light has been proved by

  • Law of Einstein
  • Law of light
  • Law of Refraction
  • Law of Thomas

The speed of light in water is

  • Two-quarters of light speed in vacuum
  • Three-quarters of light speed in vacuum
  • one-third of light speed in vacuum
  • two-third of speed of light in vacuum

The types of cells in retina of eye include

  • cones and fisheries
  • cones and spheres
  • cones and rods
  • rods and spheres

The name of the scientist who presented theory of dispersion of light was

  • John Dalton
  • Isaac Newton
  • Albert Einstein
  • Martin Charles burgh

The sensitive screen at the back of eye is called

  • blind spot
  • conjunctiva
  • cornea
  • retina

Light is a form of

  • heat
  • power
  • energy
  • force

The angle at which all refraction of light stops is known as

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

Overlapping of two primary colors forms a

  • tertiary color
  • mixed color
  • secondary color
  • both a and b

Ray of light is always refracted in

  • indefinite direction
  • definite direction
  • definite position
  • indefinite position

Rainbows are formed when sunlight reflects through

  • fog
  • millions of rain droplets
  • clouds
  • mist

Focal length is a length which lies between

  • lens and object
  • lens and image
  • lens and second focus
  • lens and focal point

Rainbow is believed to be

  • spherical
  • full circle
  • hot plasma
  • all of above

The name given to a change in speed of light is known as

  • reflection
  • critical change
  • refraction
  • diffraction of light
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0