In the convex mirror, the size of the image is always

  • larger than object
  • equal to object
  • smaller than object
  • moderate sized

The lens which is thin at the center but thick at the edges is called

  • counter lens
  • fiber lens
  • convex lens
  • concave lens

The disability of the eye to form distinct images of nearby objects on its retina is known as

  • nearsightedness
  • farsightedness
  • stress
  • accommodation

If the object is towards the right side of the lens, it is said to be

  • real object
  • virtual object
  • small object
  • thick object

A mirror whose polished, reflecting surface is a part of a hollow sphere of glass or plastic is known as

  • plane mirror
  • virtual mirror
  • silver mirror
  • spherical mirror

If the object is at focal length and it is positive then the mirror is

  • concave mirror
  • convex mirror
  • concave lens
  • convex lens

For a real image made on the right side of the lens by a real object, the image distance is

  • positive
  • negative
  • zero
  • constant

The angle of incidence that causes refracted ray to bend through 90° is called

  • acute angle
  • obtuse angle
  • perpendicular
  • critical angle

The magnification of a telescope is equal to

  • fofe
  • fp
  • 1q
  • fq

Water separates the colors of sunlight into a rainbow due to

  • rain
  • dispersion in sunlight
  • dispersion in drops
  • clouds

An object and its image in a concave mirror are of the same height, yet inverted when the object is 30 cm from the mirror. The focal length of the mirror should be

  • 10 cm
  • 12 cm
  • 15 cm
  • 18 cm

When light travels in water or glass, its speed

  • increases
  • remains constant
  • becomes zero
  • decreases

If the object is towards the left side of the lens, it is said to be

  • real object
  • virtual object
  • small object
  • thick object

Any transparent material having two surfaces of which at least one is curved is called

  • endoscope
  • lens
  • light pipe
  • microscope

A mirror whose inner curved surface is reflecting is

  • concave mirror
  • convex mirror
  • concave lens
  • convex lens

The SI unit for the power of lens is

  • Watt
  • Diopter
  • Meter
  • Seconds

The cladding is made of glass or plastic of relatively

  • low refractive index
  • no refractive index
  • zero refractive index
  • high refractive index

The process of blending of light as it passes from air into glass and vice versa is called

  • reflection of light
  • deflection of light
  • defraction of light
  • refraction of light

To explore the interior organs of the body for a surgical purpose, we use

  • lenses
  • microscope
  • endoscope
  • light pipe

The variation of the focal length of the eye lens to form a sharp image on the retina is called

  • near point
  • far point
  • accommodation
  • hypermetropia

The mirror used in headlights is

  • parabolic
  • silvered
  • plane
  • hyperbolic

A magnifying glass is also called

  • compound microscope
  • simple microscope
  • single curved lens
  • electronic microscope

If a concave lens has a focal of 10 cm. At what distance should the object from the lens be placed so that it forms an image at 5 cm from the lens?

  • 5 cm
  • 15 cm
  • 20 cm
  • 10 cm

Pole is also termed as

  • center of curvature
  • focal length
  • principal axis
  • vertex

In photograph enlarger, the object is placed

  • between F and 2F
  • beyond 2F
  • at F
  • less than F

A magnifying glass is a lens that forms a virtual image that is

  • smaller than the object
  • equal to the object
  • larger than the object
  • none of above

The ability to distinguish between two closely placed objects or point sources is called an instrument's

  • reflecting power
  • resolving power
  • optical power
  • acoustical power

A telescope can make stars look

  • bigger
  • brighter
  • smaller
  • all of above

An endoscope is used to explore the

  • Inner organs of human body
  • skin
  • tissues of human body
  • exocrine glands

The inability of the eye to see the image of the objects is called

  • defect of vision
  • near point
  • far point
  • accommodation
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