CBSE Questions for Class 10 Physics Light Reflection And Refraction Quiz 7 - MCQExams.com

Second law of refraction is also called:
  • Shell's Law
  • Snell's Law
  • Hooke's Law
  • none of the above
Tracing the light ray in a glass slab, which of the following quantities can be evaluated.
  • Frequency of light wave
  • Refractive index of slab
  • Density of glass slab
  • Components of colour present in the incident light
SI unit of refractive index is
  • $$\displaystyle m/s$$
  • $$\displaystyle Hz$$
  • $$\displaystyle \overset { \circ }{ A } $$
  • None
Mirror made by silvering the outer surface of the piece of a hollow sphere:
  • convex mirror
  • concave mirror
  • both
  • none
Mirror made by silvering the inner surface of the piece of a hollow sphere is:
  • convex mirror
  • concave mirror
  • both
  • none
A light is travelling from air into a medium. The velocity of light in a medium is reduced to 0.75 times the velocity in air. Assume that angle of incidence $$i$$ is very small, the deviation of the ray is :
  • $$i$$
  • $$\dfrac{i}{3}$$
  • $$\dfrac{i}{4}$$
  • $$\dfrac{3i}{4}$$
According to laws of refraction(Snell's law) :
  • $$\angle i=\angle r$$
  • $$sin \ i = sin \ r$$
  • $$\dfrac{sin \ i}{sin \ r}$$ = constant
  • $$tan \ i = tan \ r$$
During refraction of light, which of the following quantity does not change?
  • Velocity
  • $$\displaystyle \lambda $$
  • Amplitude
  • Frequency
For the same angle of incidence, the angles of refraction in media P, Q, R and S are $$50^o, 40^o, 30^o, 20^o$$, respectively. The speed of light is minimum in medium :
  • P
  • Q
  • R
  • S
Refraction of light can take place at boundary of
  • Transparent Media
  • Opaque Media
  • Any Medium
  • Rarer Medium
Equi convex is a type of ______  lens. Fill in the blank.  
  • Diverging
  • Converging
  • Both
  • None
A convex mirror used for rear view on an automobile has a radius of curvature of 3.00m. If a bus is located at 5.00m from this mirror, find magnification?
  • +0.23
  • -0.23
  • +0.45
  • -0.45
Which one of the following materials cannot be used to make a lens?
  • Water
  • Glass
  • Plastic
  • Clay
An imaginary line joining the centres of curvature of the two spheres, of which lens is a part is known as Focal length $$(f)$$. Is above statement True or False?
  • True
  • False
A spherical mirror and a thin spherical lens have each a focal length of $$-15$$ cm. The mirror and lens are likely to be :
  • both concave
  • both Convex
  • the mirror is concave and lens is convex
  • the mirror is convex but lens is concave
The center of the imaginary glass sphere of which the lens is a part is known as?
  • Centre of Curvature (C)
  • Optic Centre (O)
  • Principal Focus of Convex Lens (F)
  • Aperture
A point within the lens, where a line drawn through the diameter of lens meets principal axis is known as
  • Focal length
  • Optic Center
  • Aperture
  • Center of curvature
Light ray that strikes surface of a glass slab normally will deviate from its path.
  • True
  • False
The speed of light in glass slab is ________ compared to that in air. Fill in the gap.
  • more
  • less
  • the same
  • can not be decided
Which of the below term has the property where light rays passing through this point emerge without deviation from lens?
  • Optical Center
  • Center of curvature
  • Radius of curvature
  • Focal length
Which of the below is one of the laws of refraction?
  • The incident ray, the normal and the refracted ray, all lie in a different plane.
  • The incident ray, the normal and the refracted ray, all lie in the same plane.
  • The incident ray, the normal and the refracted ray, all lie in opposite plane.
  • The incident ray and the refracted ray, both lie in a plane.
A parallel beam of light rays travelling parallel to principal axis after passing through the lens actually meet. This phenomena happens for which type of lens?
  • Concave
  • Convex
  • Bipolar
  • Cylindrical
What is principal focus for concave lens?
  • It is a point on the principal axis of a concave lens from which a parallel beam of light rays, travelling parallel to the principal axis, appears to come after passing through the lens.
  • It is a point on the principal axis of a concave lens from which a perpendicular beam of light rays, travelling perpendicular to the principal axis, appears to come after passing through the lens.
  • It is a point on the principal axis of a convex lens at which a parallel beam of light rays, travelling parallel to principal axis, meet after passing through the lens.
  • None
The effective diameter of the lens through which refraction takes place is known as Aperture. Is the statement True or False?
  • True
  • False
How many center of curvatures does a biconvex lens possess?
  • 4
  • 3
  • 2
  • 1
What is refraction?
  • Phenomenon in which ray of light deviates from its path at the surface of separation of two media.
  • Phenomenon in which ray of light reflects from its path at the surface of separation of two media.
  • Phenomenon in which ray of light deviates from its path at the surface of 1st media
  • None
The refractive index of water and glass with respect to air is $$1.3$$ and $$1.5$$ respectively. Then the refractive index of glass with respect to water is
  • $$\dfrac{2.6}{1.5}$$
  • $$\dfrac{1.5}{2.6}$$
  • $$\dfrac{1.3}{1.5}$$
  • $$\dfrac{1.5}{1.3}$$
A wave has velocity v in medium P and velocity 2v in medium Q. If the wave is incident in medium P at an angle of $$30^o$$, then the angle of refraction will be 
  • $$30^o$$
  • $$45^o$$
  • $$60^o$$
  • $$90^o$$
A light moves from denser to rarer medium, which of the following is correct?
  • Energy increases
  • Frequency increases
  • Velocity increases
  • None of these
What happens when light ray passes through a glass slab?
  • Light ray first bends towards normal then away from normal
  • Light ray first bends away from normal then towards normal
  • Light ray bends towards normal at both the surfaces
  • Light ray bends away from normal at both surfaces
Which of the following signifies Snell's law?
  • $$ \dfrac {sin \ i}{ sin\ r}= constant $$
  • $$ \dfrac {sin \ r}{ sin\ i}= constant $$
  • $$ sin \ i + sin \ r = Constant$$
  • none of the above 
When a light ray, incident at an angle passes through a glass slab then _______ ray is shifted laterally. 
  • Incident ray
  • Refracted ray
  • Emergent ray
  • None of these
A monochromatic ray of light enters a glass slab $$\left( n=1.5 \right) $$ along the normal to the surface. The angle of deviation of the refracted ray is:
  • $${ 90 }^{ 0 }$$
  • $${ 45 }^{ 0 }$$
  • $${ 30 }^{ 0 }$$
  • $${ 0 }^{ 0 }$$
Identify which of the following mirrors converge the parallel light rays to its focus ?
  • plane
  • convex
  • concave
  • Inverted
  • upright
A light ray passes from a material of low refractive index to one of high refractive index. Which of the pairs of quantities listed below describes the light ray as it strikes and passes through the interface between the two materials? Match the descriptions below with the statement that best describes the situation.
Statement: A part of the light ray remains inside the low refractive index material.
  • the angle of refraction is larger than the angle of incidence
  • the angle of refraction is equal to the angle of incidence
  • the angle of reflection is larger than the angle of incidence
  • the angle of incidence equals the angle of reflection
  • the angle of reflection is smaller than the angle of incidence
A light ray parallel with the principle axis falls on a thin lens having a focal point $$f$$ as shown in the above figure. Identify which of the following statements best describes the lens?
486431.jpg
  • The lens is a converging lens
  • The lens is thicker in the center than on the edges
  • The lens is thinner in the center than on the edges
  • The lens will always produce a real image
  • The lens will always produce a virtual image
According to Snell's Law of refraction, the ratio of the refractive index is related to the inverse ratio of the ____ of the angles.
  • sine
  • cosine
  • tangent
  • natural log
  • square
A ray of light incident on the interface of the medium $$A$$ and $$B$$ and it passes through medium $$B$$ as shown in above figure. Choose the correct option.
487095_48e351d8c4be4711ad02f2ce81dfd79a.png
  • Medium 1 is more dense than medium 2
  • Medium 1 less dense than medium 2
  • The speed of the light in medium 1 is greater than the speed of the light in medium 2
  • The frequency of the light in medium 1 is greater than the frequency of the light in medium 2
  • The wavelength is the same in medium 1 and medium 2
A beam of light passing from air enters into the glass. Identify which of the following statements is true?
  • The angle of incidence is greater than the angle of refraction in the glass.
  • The angle of incidence is less than the angle of refraction in the glass.
  • The angle of incidence is equal to the angle of refraction in the glass.
  • The frequency of the light decreases.
  • The frequency of the light increases.
Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab."
Which of the marked set-ups is likely to give best results (P1 and P2 are the positions of pins fixed on the incident ray) ?
494523.JPG
  • I
  • II
  • III
  • IV
Choose the correct option which is true about a bi-concave lens :
  • Its focal length is positive
  • It cannot form real images
  • It cannot form virtual images
  • It can magnify objects
  • None of the above
A converging lens has formed an image at a distance of 60 cm from the lens and the height of the image is $$\frac{1}{4}$$ the height of the object. Calculate the focal length of the lens. 
  • 36 cm
  • 45 cm
  • 48 cm
  • 72 cm
  • 80 cm
A ray of light incident on a piece of glass as shown above. The light passes through the glass and emerged into the air. A, B, C, D and E are possible paths of light. Choose the best possible path of light.
487995.PNG
  • A
  • B
  • C
  • D
  • E
In your laboratory, you trace the path of light rays through a glass slab for different values of angle of incidence $$(\angle i)$$ and in each case, measure the values of the corresponding angle of refraction $$(\angle r)$$ and angle of emergence$$(\angle e)$$. Based on your observations, the correct conclusion is
  • $$\angle i$$  is more than $$\angle r$$ , but nearly equal to $$\angle e$$ 
  • $$\angle i$$  is less than $$\angle r$$ , but nearly equal to $$\angle e$$ 
  • $$\angle i$$ is more than $$\angle e$$ , but nearly equal to $$\angle r$$ 
  • $$\angle i$$  is less than $$\angle e$$ , but nearly equal to $$\angle r$$ 
On the basis of their experiment, "To trace the path of a ray of light through a rectangular glass slab," students of a class arrived at which one of the following conclusions : 
  • Angle of incidence is greater than the angle of emergence, 
  • Angle of emergence is smaller than the angle of refraction. 
  • Emergent ray is parallel to the refracted ray. 
  • Incident ray and emergent ray are parallel to each other. 
Refraction of light occurs when:
  • light passes through a narrow opening.
  • light passes into a new transparent material (not head on) in which it travels at a new speed.
  • light strikes the edge of an object.
  • light becomes polarized.
  • light passes through a diffraction grating.
After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below:
S.No.$$\angle i$$$$\angle r$$$$\angle e$$
I$$30^o$$$$20^o$$$$31^o$$
II$$40^o$$$$25^o$$$$40^o$$
III$$50^o$$$$31^o$$$$49^o$$
The correct observations are:
  • I and II
  • II and III
  • I and III
  • I, II and III
A light ray travels at some angle (not head-on) from water in a rectangular aquarium, through the glass side, and out into the air. The indices of refraction for water, glass, and air are 1.33, about 1.6, and 1.0, respectively.
Rank the materials in descending order according to the angles of refraction made by the light ray with the normal in each.
  • air, water, glass.
  • air, glass, water.
  • water, air, glass.
  • water, glass, air
  • glass, water, air
Light moves from air into water. The light makes an angle of $$47^0$$ with the normal in the air. What angle will it make with the normal in the water?
The index of refraction for air is $$1.00$$.
The index of refraction for water is $$1.33$$.
  • $$47^o$$
  • $$77^o$$
  • $$43^o$$
  • $$25^o$$
  • $$33^o$$
A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all possible precautions at each step of the experiment. At the end of the experiment, on analyzing the measurements, which of the following conclusions is he likely to draw?
  • $$\angle i = \angle e < \angle r$$
  • $$\angle i < \angle e < \angle r$$
  • $$\angle i > \angle e > \angle r$$
  • $$\angle i = \angle e > \angle r$$
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