CBSE Questions for Class 10 Physics Light Reflection And Refraction Quiz 6 - MCQExams.com

Magnification for erect and inverted image is:
  • $$+ve$$ and $$-ve$$ respectively
  • $$-ve$$ and $$+ve$$ respectively
  • $$+ve$$
  • $$-ve$$
Refractive index of diamond with respect to glass is $$1.6$$ and absolute refractive index of glass is $$1.5$$. Find out the absolute refractive index of diamond.
  • $$1.06$$
  • $$0.93$$
  • $$2.4$$
  • $$0.75$$
Which of the following comes under laws of refraction?
  • Angle of incidence is equal to angle refraction
  • Angle of refraction is greater than angle of incidence
  • Value of $$\dfrac {sin\ i}{sin\ r}$$ is known as refractive index of the medium
  • All
............... lens is known as diverging lens.
  • Convex
  • Concave
  • Sperical
  • Plano convex
Mark the correct statement
  • Centre of reflecting surface of a spherical mirror is called the centre of curvature
  • Pole lies outside the mirror
  • Pole is represented by Po
  • None
Transparent medium bounded by two refracting surfaces in which at least one of these is curved is a property of:
  • Mirror
  • Lens
  • Prism
  • None
A concave mirror produces $$2$$ times magnified real image of an object placed at $$5 cm$$ in front of it. Where is image located?
  • $$10 cm$$
  • $$-5 cm$$
  • $$-10 cm$$
  • $$2.5 cm$$
Mark the correct statement:
  • Centre of curvature is represented by "C"
  • Centre of curvature always lies inside the reflecting surface
  • Centre of curvature always lies in front of mirror
  • All
A concave mirror produces $$10$$ times enlarged image (real) of an object placed $$1 cm$$ in front of it. Where is the image located?
  • $$5\ cm$$
  • $$-10\ cm$$
  • $$-5\ cm$$
  • $$10\ cm$$
Magnification produced by plane mirror is $$+1$$. It means:
  • Image formed by plane mirror is greater than size of the object
  • Image formed by plane mirror is erect and of same size as the object
  • Image formed by plane mirror is smaller than size of object and is virtual
  • None
The focal length of a spherical mirror of radius of curvature $$40 cm$$ is
  • $$10 cm$$
  • $$20 cm$$
  • $$80 cm$$
  • None
A ray of light travels from air to glass at an angle of incidence of $$37^{\circ}$$, the angle of refraction is $$24^{\circ}$$. What is the refractive index of glass?
(Given: $$\sin 37^{\circ} = 0.60, \sin 24^{\circ} = 0.40)$$
  • $$0.66$$
  • $$0.133$$
  • $$1.5$$
  • None
Mark the incorrect statement/statements:
  • Centre of curvature is not a part of the mirror
  • Pole is represented by "Po"
  • Pole lies outside the mirror
  • All
An object is placed at a distance of $$100 cm$$ from a concave lens of focal length $$40 cm$$. Find the distance of the position of image from the lens in $$cm$$.
  • $$0.035$$
  • $$28.57$$
  • $$0.015$$
  • None
A convex lens of focal length $$5\ cm$$ is placed at a distance of $$6\ cm$$ from a wall. How far from the lens should an object be placed so as to form its real image on the wall?
  • $$30 cm$$
  • $$-30 cm$$
  • $$1.2 cm$$
  • $$-1.2 cm$$
All distances are measured from the .............. of mirror
  • Focus
  • Centre of curvature
  • Pole
  • Infinity
The ratio of the sine of angle  of incidence to the sine of angle of refraction is a constant for :
  • a given pair of media and given colour of light
  • a given pair of media and any colour of light
  • any pair of media and given colour of light
  • any pair of media and any colour of light
Change in the direction of light when it passes from one medium to another is called ............
  • reflection
  • refraction
  • diffraction
  • scattering
Centre of curvature of a concave mirror lies .......
  • Behind it
  • In front of it
  • In its centre
  • None
The curved surface of a shining spoon could be considered as a ...............
  • Curved mirror
  • Plane mirror
  • Concave mirror only
  • None
When a ray of light passes through a rectangular slab, made up of some transparent material other than glass, the emergent ray is
  • Parallel to the incident ray produced
  • Perpendicular to the incident ray produced
  • Oblique to the incident ray produced
  • Inclined to the incident ray produced
When light travels from air to water there is ...........................
  • Reflection of light
  • Refraction of light
  • Diffraction of light
  • Scattering of light
Due to refraction,
  • Image in the plane mirror is clear
  • Polished black surfaces shine
  • speed of light is constant in all mediums
  • A glass sphere appears attractive
Laws of refraction to hold good:
  • one medium has to be air
  • one medium has to be glass
  • one medium has to be solid
  • two media should have different optical densities
The surface of the spoon which is curved inwards can be approximated to be ($$a$$) .......... mirror and the surface of the spoon which is bulged outwards can be approximated to ($$b$$) ......... mirror.
  • $$(a) = convex, (b) = concave$$
  • $$(a) = concave, (b) = convex$$
  • $$(a) = convexo \ convex, (b) = concavo \ concave$$
  • $$(a) = concavo \ canvex, (b) = convexo \ concave$$
The centre of the sphere from which the spherical mirror has been formed is called ....................
  • Pole
  • Centre of curvature
  • Focus
  • None
For a light ray undergoing refraction, $$\dfrac{sin i}{sin r}=$$
  •  $$\frac{\mu_2}{\mu_1}$$
  • $$1$$, always
  • $$0$$, always
  • none of these
The incident ray, the normal at the point of incidence and the refracted ray:
  • lie on mutually orthogonal planes
  • lie on mutually parallel planes
  • lie on the same plane
  • lie on different arbitrary planes
The cut part of sphere is coated outside with silver or similar material. What kind of mirror does it form?
  • Convex mirror
  • Concave mirror
  • Plane mirror
  • None
Fill in the blank:

Focal length ($$f$$) is the distance of principal focus from ______ of mirror.
  • Centre of curvature
  • Focus principal (F)
  • Pole (P)
  • None
A concave mirror always form a real image. This statement is:
  • True
  • False
What is the difference between concave and convex mirrors? Choose the correct statement ?
  • Convex mirror is curved outwards and concave mirror is curved inwards
  • Focal point is in front of convex mirror and for a concave mirror, it is behind
  • Centre of curvature is in front of convex mirror and for a concave mirror, it is behind
  • None of these
When a ray of light passes through the rectangular glass slab, the angle of deviation is
  • equal to $$0$$
  • an acute angle
  • an obtuse angle
  • equal to $$\dfrac{\pi}{2}$$
When a ray of light passes through a rectangular glass slab:
  • After the first refraction, it bends towards the normal and after the second refraction it bends away from the normal
  • After the first refraction, it bends away from the normal and after the second refraction it bends towards the normal
  • After both refractions, it bends towards the normal
  • After both refractions, it bends away from the normal
Fill in the blanks:
________ is geometric centre of spherical mirror.
  • Principal force (F)
  • Centre of curvature (C)
  • Pole (P)
  • Secondary focus $$(F_2)$$
A ray of light passes through a glass slab and the angle of emergence is found to be smaller than the angle of incidence. So, we may conclude that the glass slab
  • Is rectangular in shape
  • Is square in shape
  • Is not rectangular or square in shape
  • May or may not be rectangular in shape
A man focused an inverted image formed by a lens. It can be:
  • Convex lens
  • Concave lens
  • Convex or concave lens
  • Plane mirror
Principal axis is the line joining the pole and the:
  • Principal line
  • Centre of curvature
  • Mirror
  • None of these
The primary phenomenon in the working of lens is
  • Reflection
  • Refraction
  • Scattering
  • Diffusion
Which of the following is included in laws of refraction?
  • $$\dfrac{sin \ i}{sin\  r}=\mu$$
  • The incident ray, the refracted ray and normal at the point of incidence all lie in the same plane
  • $$\angle \ i=\angle\ r$$, where $$r$$ is angle of refraction
  • $$\angle \ i<\angle\ r$$, where $$r$$ is angle of refraction
To find the trace of light in a glass slab using pins, minimum number of pins required are
  • 2
  • 3
  • 4
  • 6
Occurrence of mirage in deserts in summer is an example of ..........................
  • reflection of light
  • refraction of light
  • propagation of sound
  • conduction of heat
A straight line passing through the two centres of curvature of lens is called:
  • Normal
  • Principal axis
  • Centre axis
  • Diameter axis
In the given figure, diameter of lens equals:
454513_78484832ee6945f0a40ca869815f5bcf.png
  • $$FO$$
  • $$2FO$$
  • $$3FO$$
  • $$4FO$$
A reflecting surface which is a part of a sphere is called:
  • concave mirror
  • convex mirror
  • spherical mirror
  • all of these
The refractive index of a medium is ______  to the speed of light in the medium.
  • directly proprtional
  • inversely proportional
  • independent
  • exponentially increasing
According to laws of refraction, refraction of light at the boundary between two different regions follow:
  • that the incident ray, the normal at the point of incidence and the refracted ray, all lie in the same plane.
  • that for a given pair of media and given colour of light, the ratio of the sine of angle of incidence to the sine of angle of refraction is constant.
  • both A and B
  • neither A nor B
_______ lens is thickest in the middle and ________ lens is thinnest at the middle
  • Concave, Convex
  • Convex, Concave
  • Convex, Plane
  • Convex, Convex
The refractive index of a medium:
  • is defined with respect to another medium
  • is an absolute constant for a medium
  • depends on the frequency of the light in the medium
  • is more for higher intensity of light ray
Given a trace of light, refractive index of the medium can be found by using:
  • universal Law of light
  • Shell's Law
  • Snell's Law
  • Hooke's Law
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