CBSE Questions for Class 10 Physics Light Reflection And Refraction Quiz 5 - MCQExams.com

Magnification produced by a convex mirror is always:
  • equal to 1
  • less than 1
  • more than 1
  • zero
A ray of light passes from air into water. The angle of refraction will be
  • Equal to the angle of incidence
  • Smaller than the angle of incidence
  • Greater than the angle of incidence
  • Equal to $${ 45 }^{ \circ }$$
Mirror equations for convex mirror and concave mirror are:
  • Same
  • Different
  • Different depending on object position
  • Same for only a few image positions
The twinkling of stars is due to atmospheric
  • Refraction of light
  • Reflection of light
  • Scattering of light
  • Dispersion of light
A diverging lens of 20 cm focal length forms on image 15 cm from the lens. What is the distance of the object from the lens?
  • 20 cm
  • 15 cm
  • 60 cm
  • 30 cm
The refractive index of water with respect to air is 1.The refractive index of air with respect to water will be
  • 0.25
  • 0.50
  • 1.00
  • 0.75
An object is placed $$15\ cm$$ from a diverging mirror of radius of curvature $$20\ cm$$. What is the image magnification produced?
  • $$+0.4$$
  • $$-0.4$$
  • $$+2$$
  • $$-2$$
Linear magnification produced by a concave mirror may be 
  • Equal to I
  • Less than I
  • More than I
  • All of the above
If linear magnification for a spherical mirror is $$\dfrac{3}{2}$$, then we may write: (symbols have their usual meanings) 
  • $$f=\dfrac{u}{2}$$
  • $$f=\dfrac{3u}{2}$$
  • $$f=\dfrac{3u}{5}$$
  • None of these
The term refraction of light is best described by:
  • The bending of light rays when they enter from one medium to another medium
  • Splitting of white light into seven colours when it passes through the prism
  • Bending of light round corners of obstacles and apertures
  • Coming back of light from a bright smooth surface
The focal length of a concave mirror depends on:
  • The radius of curvature of the mirror
  • The object distance from the mirror
  • The image distance from the mirror
  • Both the image and the object distance
The magnification produced by a concave mirror:
  • is always more than one
  • is always less than one
  • is always equal to one
  • may be less than, equal to or greater than one
When reflection takes place from a spherical mirror, positions of the object and its image are measured from the ......................
  • poles
  • focus
  • radius of curvature
  • focal plane
Twinkling of stars is on account of
  • Large distance of stars and storms in air
  • Small size of stars
  • Large size of stars
  • Large distance of stars and fluctuations in the density of air
The radius of curvature of a plane mirror is:
  • zero
  • infinite
  • negative
  • finite
$$\dfrac {\sin i}{\sin r} = constant$$. This is
  • Newton's law
  • Snell's law
  • Both
  • None
A mirage occurs because
  • The refractive index of atmosphere increases with height
  • The refractive index of atmosphere decreases with height
  • The hot ground acts like a mirror
  • Refractive index remains constant with height
When rays of light fall on a convex lens, it
  • Converges them
  • Does not bend them
  • Diverges them
  • Enlarges them
If magnification is positive, the nature of the image is:
  • real and inverted
  • virtual and erect
  • real
  • none of these
Twinkling of stars is due to
  • variation of refractive index in the earth's atmosphere
  • the fact that light is not emitted by the stars continuously
  • the absorption oflight by earth's atmosphere
  • none of these
The principal axis is also called _______ of the lens.
  • optical axis
  • x-axis
  • y-axis
  • axis
The distance between the extreme points on the periphery of the mirror is called :
367746_370db75e57844997b79c0f85058c9cdd.png
  • focal length
  • radius of curvature
  • aperture
  • pole
If we say that the focal length of a spherical mirror is $$n$$ times its radius of curvature, then $$n$$ must be
  • $$2.0$$
  • $$1.5$$
  • $$0.2$$
  • $$0.5$$
The ratio of the size of the image to the size of the object is known as :
  • The Focal Plane
  • The Transformation ratio
  • The Efficiency
  • The Magnification ratio
A convex lens forms a virtual image of an object placed at $$15  cm$$ from the lens. The focal length of the lens can be
  • $$2 cm$$
  • $$8 cm$$
  • $$15 cm$$
  • $$18 cm$$
When a ray of light passes from an optically less dense medium to a more dense medium, it :
  • Goes undeviated
  • Bends towards the normal
  • Bends away from the normal
  • Gets reflected
The middle point of a spherical mirror is called
  • pole
  • centre of sphere
  • centre of curvature
  • none of these
The image of our face in a plane mirror is :
  • real
  • magnified
  • diminished
  • virtual
The bending of light ray after passing through a medium is commonly known as :
  • Refraction
  • Scattering
  • Reflection
  • Interference
The distance between the optical centre of lens and the focal point is called :
  • Reflective index
  • Focal length
  • Radius of curvature
  • Plane of incidence
If a lens diverges a parallel beam of light, the lens is -
  • Convex
  • Concave
  • Cylindrical
  • Parabolic
Light enters from denser to rarer medium. Choose the correct option.
  • Angle of refraction = Angle of incidence
  • Angle of refraction > Angle of incidence
  • Angle of refraction < Angle of incidence
  • Angle of refraction $$\geq$$ Angle of incidence
A concave mirror is made from a hollow sphere of radius of curvature $$30 cm$$.  If an object of height $$2 cm$$ is placed at $$10 cm$$ from the pole of the mirror, determine the size of the image :
  • $$3 cm$$
  • $$6 cm$$
  • $$12 cm$$
  • $$24 cm$$
If the refractive index of water and glass with respect to air are, respectively, $$\displaystyle \frac {4}{3}$$ and $$\displaystyle \frac {3}{2}$$ then what will be the refractive index of glass with respect to water?
  • $$\displaystyle \frac {9}{8}$$
  • $$\displaystyle \frac {8}{9}$$
  • $$\displaystyle \frac {4}{3}$$
  • $$\displaystyle \frac {3}{2}$$
An object is placed at 40 cm from the optic centre of a convex lens on its principal axis. if the focal length of the lens is 24 cm, find how far from the lens the screen should be placed to obtain a well-defined image.
  • 48 cm
  • 38 cm
  • 50 cm
  • 60 cm
Calculate the magnification of an object if it is kept at a distance of $$3 cm$$ from a concave mirror of focal length $$4 cm$$:
  • $$3$$
  • $$6$$
  • $$9$$
  • $$4$$
When a ray of light strikes a plane mirror along the normal, the angle of incidence is -
  • $$\displaystyle 90^{\circ}$$
  • zero
  • $$\displaystyle 45^{\circ}$$
  • none of these
A spherical mirror whose inner hollow surface is the reflecting surface is:
  • Convex mirror
  • Concave mirror
  • Convex lens
  • Concave lens
The distance between the pole and centre of curvature of a spherical mirror is called _________ .
  • radius of curvature
  • focal length
  • object distance
  • image height
The angle between reflected ray and the _______ is called angle of reflection
  • normal
  • incident ray
  • reflecting surface
  • none of the above
Identify the mirror
447787_3b7c0fff85c84b2694beea33a66bc0d8.png
  • Convex
  • Concave
  • Biconcave
  • Biconvex
A spherical mirror with its outer bulging surface as the reflecting surface is a :
  • convex mirror
  • concave mirror
  • plane mirror
  • none of these
State whether true or false.
The straight line joining the centre of curvature and pole of a spherical mirror is called plane of incidence.
  • True
  • False
Fill in the blanks
The ray of light bending away from normal is called _____. 
  • Refracted ray
  • Incident ray
  • Emergent ray
  • None of the above
When light moving in one medium falls at the surface of another medium, _______ light returns back to the same medium.
  • all of
  • a part of 
  • no
  • either all or no 
Refraction occurs due to:
  • Change in direction of light
  • Change in speed of light
  • Change in quality of light
  • All
A man sees a small stationary fish deep in a very clear lake and shoots it accurately. He will
  • hit the fish
  • miss the fish
  • hit but fish will not die
  • may hit or miss depending on the bullet
Which phenomena of light makes a pool of water appears to be less deep than it actually is?
  • Reflecion
  • Refraction
  • Diffraction
  • Lateral inversion
Which of the states Snell's law?
  • Incident ray, refracted ray and the normal at the point of incidence all lies in the same plane
  • $$\dfrac {sin i}{sin r} =$$ constant (for a given media)
  • Angle of incidence $$=$$ Angle of refraction
  • All
Fill in the blanks:
A spherical mirror whose reflecting surface is curved outwards is called _________.
  • concave mirror
  • convex mirror
  • plane mirror
  • biconvex mirror
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