Light: Mirrors and Lenses Class 8 Worksheet with Answers

What Are Spherical Mirrors?

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What Are Spherical Mirrors? under Light: Mirrors and Lenses for Grade 8 CBSE.

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1.
$A ray of light parallel to the principal axis, after reflection from a convex mirror, appears to come from:$
A. $The center of curvature$
B. $The pole$
C. $The principal focus$
D. $Infinity$
2.
$Which part of the mirror represents its size?$
A. $Focal length$
B. $Aperture$
C. $Radius of curvature$
D. $Pole$
3.
$The point where the principal axis meets the spherical mirror is the:$
A. $Focus$
B. $Pole$
C. $Center of curvature$
D. $Aperture$
4.
$If an image is formed behind the mirror, it is always:$
A. $Real$
B. $Virtual$
C. $Inverted$
D. $Diminished$
5.
$Two spherical mirrors, A and B, are cut from the same hollow glass sphere. Mirror A is silvered on the outer surface, and Mirror B is silvered on the inner surface. Which of the following is true?$
A. $Mirror A has a larger focal length than Mirror B$
B. $Both mirrors have the same magnitude of focal length$
C. $Mirror B has a larger focal length than Mirror A$
D. $Focal length depends only on the thickness of the silvering$
6.
$15\text{ cm}$
A. $11.25\text{ cm}$
B. $20\text{ cm}$
C. $15\text{ cm}$
D. $30\text{ cm}$
7.
$Based on the classifications in the flowchart, which mirror is typically used by dentists to see a magnified (enlarged) image of a patient's teeth?$
A. $Mirror X$
B. $Mirror Y$
C. $Both Mirror X and Y$
D. $Neither mirror$
8.
$Which of the following is NOT a property of a convex mirror?$
A. $It can form a real image of a real object$
B. $It always forms a virtual image$
C. $The image is always upright (erect)$
D. $The image is always smaller than the object$
9.
$m$
A. $The image is real and inverted$
B. $The image is virtual and erect$
C. $The image is smaller than the object$
D. $The mirror is convex$
10.
$The 'Pole' of a spherical mirror lies:$
A. $On the surface of the mirror$
B. $At the center of the sphere$
C. $At the principal focus$
D. $Between the mirror and the object$

Download the worksheet for Light: Mirrors and Lenses - What Are Spherical Mirrors? to practice offline. It includes additional chapter-level practice questions.

What Are the Characteristics of Images Formed by Spherical Mirrors?

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What Are the Characteristics of Images Formed by Spherical Mirrors? under Light: Mirrors and Lenses for Grade 8 CBSE.

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1.
$A mirror which has a flat reflecting surface is a ________.$
A. $Spherical mirror$
B. $Plane mirror$
C. $Convex mirror$
D. $Concave mirror$
2.
$A ray of light passing through the center of curvature of a concave mirror is reflected ________.$
A. $Through the focus$
B. $Parallel to the principal axis$
C. $Back along the same path$
D. $Through the pole$
3.
$Which of the following is used as a security mirror in shops?$
A. $Concave mirror$
B. $Plane mirror$
C. $Convex mirror$
D. $Bifocal mirror$
4.
$The focus of a convex mirror is ________.$
A. $Real$
B. $Virtual$
C. $At the pole$
D. $In front of the mirror$
5.
$In a concave mirror, to get a virtual image, where should the object be placed?$
A. $P$
B. $F$
C. $C$
D. $C$
6.
$If a mirror forms an erect image for all positions of the object, the mirror is:$
A. $Only plane$
B. $Only convex$
C. $Either plane or convex$
D. $Only concave$
7.
$A ray of light passing through the center of curvature of a spherical mirror retraces its path because:$
A. $90^\circ$
B. $0^\circ$
C. $The mirror is transparent at that point$
D. $The center of curvature is the same as the focus$
8.
$A student wants to use a mirror to burn a piece of paper using sunlight. Which mirror should be used and where should the paper be placed?$
A. $Convex mirror, at the Focus$
B. $Concave mirror, at the Center of Curvature$
C. $Concave mirror, at the Focus$
D. $Plane mirror, at any distance$
9.
$What is the nature of the image formed by the outer bulging surface of a polished steel spoon?$
A. $Real, inverted, and magnified$
B. $Virtual, erect, and diminished$
C. $Real, inverted, and diminished$
D. $Virtual, erect, and magnified$
10.
$-1$
A. $Real, inverted, and same size$
B. $Virtual, erect, and same size$
C. $Real, inverted, and diminished$
D. $Virtual, erect, and magnified$

Download the worksheet for Light: Mirrors and Lenses - What Are the Characteristics of Images Formed by Spherical Mirrors? to practice offline. It includes additional chapter-level practice questions.

What Are the Laws of Reflection?

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What Are the Laws of Reflection? under Light: Mirrors and Lenses for Grade 8 CBSE.

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1.
$30^\circ$
A. $30^\circ$
B. $60^\circ$
C. $90^\circ$
D. $15^\circ$
2.
$An object that does not emit its own light is called a:$
A. $Luminous object$
B. $Non-luminous object$
C. $Transparent object$
D. $Opaque object$
3.
$Which of these is a natural phenomenon based on the dispersion of sunlight?$
A. $Eclipse$
B. $Rainbow$
C. $Thunder$
D. $Tide$
4.
$The band of seven colors obtained by dispersion of light is called:$
A. $Shadow$
B. $Image$
C. $Spectrum$
D. $Reflection$
5.
$110^\circ$
A. $55^\circ$
B. $70^\circ$
C. $35^\circ$
D. $45^\circ$
6.
$15^\circ$
A. $15^\circ$
B. $30^\circ$
C. $45^\circ$
D. $0^\circ$
7.
$Which of the following is a necessary condition for a 'real' image?$
A. $The light rays must actually meet at a point.$
B. $The light rays must appear to meet when produced backwards.$
C. $The image must be erect.$
D. $The image must be formed by a plane mirror.$
8.
$10^\circ$
A. $10^\circ$
B. $20^\circ$
C. $5^\circ$
D. $0^\circ$
9.
$Two mirrors are placed parallel to each other. A ray of light enters the space between them at an angle. The number of reflections will be:$
A. $Dependent on the length of the mirrors$
B. $Always 2$
C. $Infinite if the mirrors are infinitely long$
D. $Zero$
10.
$1.6\text{ m}$
A. $1.55\text{ m}$
B. $1.6\text{ m}$
C. $1.5\text{ m}$
D. $0.8\text{ m}$

Download the worksheet for Light: Mirrors and Lenses - What Are the Laws of Reflection? to practice offline. It includes additional chapter-level practice questions.

What Is a Lens?

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What Is a Lens? under Light: Mirrors and Lenses for Grade 8 CBSE.

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1.
$Which of these is the main difference between a mirror and a lens?$
A. $Mirrors refract light, lenses reflect light$
B. $Mirrors reflect light, lenses refract light$
C. $Mirrors are transparent, lenses are opaque$
D. $There is no difference$
2.
$If a convex lens is covered with black paper on the top half, the image formed will be ______.$
A. $Half the size$
B. $Complete but less bright$
C. $Half an image$
D. $No image at all$
3.
$Light rays that are parallel to the principal axis of a concave lens appear to ______ after refraction.$
A. $Meet at the focus$
B. $Diverge from the focus$
C. $Pass through the optical center$
D. $Stop$
4.
$Which type of lens is used in a telescope to collect light from stars?$
A. $Concave$
B. $Convex$
C. $Opaque$
D. $Flat glass$
5.
$If the lower half of a convex lens is covered with an opaque black paper, as shown in the conceptual diagram, how will it affect the image of a complete object placed at a distance?$
A. $Only the top half of the object's image will be visible on the screen$
B. $A complete image will still be formed, but it will be less bright$
C. $Only the bottom half of the object's image will be visible on the screen$
D. $No image will be formed because the lens symmetry is broken$
6.
$F$
A. $F$
B. $It emerges parallel to the principal axis$
C. $O$
D. $It reflects back towards the light source$
7.
$When a beam of light passes through a lens, the bending of light occurs at:$
A. $Only the first surface$
B. $Only the second surface$
C. $Both surfaces of the lens$
D. $The optical center only$
8.
$In an experiment to find the focal length of a convex lens, where should you place a screen to get a sharp image of a very distant object?$
A. $At the optical center$
B. $At the center of curvature$
C. $At the focus$
D. $Between the focus and the optical center$
9.
$The imaginary line passing through the centers of curvature of the two surfaces of a lens is called the:$
A. $Principal axis$
B. $Optical axis$
C. $Aperture line$
D. $Focal line$
10.
$If a lens is very thin, its power is likely to be:$
A. $Very high$
B. $Very low$
C. $Negative$
D. $Infinite$

Download the worksheet for Light: Mirrors and Lenses - What Is a Lens? to practice offline. It includes additional chapter-level practice questions.

Light: Mirrors and Lenses

What Are Spherical Mirrors?

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What Are the Characteristics of Images Formed by Spherical Mirrors?

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What Are the Laws of Reflection?

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What Is a Lens?

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