Light – Reflection and Refraction - Class 10 - Science
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Back Questions - Light – Reflection and Refraction | NCERT | Science | Class 10
Which one of the following materials cannot be used to make a lens?
(a) Water
(b) Glass
(c) Plastic
(d) Clay
The correct answer is (d) Clay.
Lenses work by refracting (bending) light, which requires the material to be transparent so that light can pass through it and be focused. Water, Glass, and Plastic are all materials that can be transparent and have the ability to refract light, making them suitable for making lenses. On the other hand, Clay is opaque and does not allow light to pass through, making it unsuitable for making lenses.
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus.
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Sign up nowWhere should an object be placed in front of a convex lens to get a real image of the size of the object?
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.
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Sign up nowA spherical mirror and a thin spherical lens have each a focal length of $-15 \mathrm{~cm}$. The mirror and the lens are likely to be
(a) both concave.
(b) both convex.
(c) the mirror is concave and the lens is convex.
(d) the mirror is convex, but the lens is concave.
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Sign up nowNo matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
(a) only plane.
(b) only concave.
(c) only convex.
(d) either plane or convex.
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Sign up nowWhich of the following lenses would you prefer to use while reading small letters found in a dictionary?
(a) A convex lens of focal length $50 \mathrm{~cm}$.
(b) A concave lens of focal length $50 \mathrm{~cm}$.
(c) A convex lens of focal length $5 \mathrm{~cm}$.
(d) A concave lens of focal length $5 \mathrm{~cm}$.
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Sign up nowWe wish to obtain an erect image of an object, using a concave mirror of focal length $15 \mathrm{~cm}$. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.
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Sign up nowName the type of mirror used in the following situations.
(a) Headlights of a car.
(b) Side/rear-view mirror of a vehicle.
(c) Solar furnace.
Support your answer with reason.
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Sign up nowOne-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations. 120 words
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Sign up nowAn object $5 \mathrm{~cm}$ in length is held $25 \mathrm{~cm}$ away from a converging lens of focal length $10 \mathrm{~cm}$. Draw the ray diagram and find the position, size and the nature of the image formed.
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Sign up nowA concave lens of focal length $15 \mathrm{~cm}$ forms an image $10 \mathrm{~cm}$ from the lens. How far is the object placed from the lens? Draw the ray diagram.
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Sign up nowAn object is placed at a distance of $10 \mathrm{~cm}$ from a convex mirror of focal length $15 \mathrm{~cm}$. Find the position and nature of the image.
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Sign up nowThe magnification produced by a plane mirror is +1 . What does this mean?
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Sign up nowAn object $5.0 \mathrm{~cm}$ in length is placed at a distance of $20 \mathrm{~cm}$ in front of a convex mirror of radius of curvature $30 \mathrm{~cm}$. Find the position of the image, its nature and size.
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Sign up nowAn object of size $7.0 \mathrm{~cm}$ is placed at $27 \mathrm{~cm}$ in front of a concave mirror of focal length $18 \mathrm{~cm}$. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image.
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Sign up nowFind the focal length of a lens of power $-2.0 \mathrm{D}$. What type of lens is this?
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Sign up nowA doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
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Sign up nowExtra Questions - Light – Reflection and Refraction | NCERT | Science | Class 10
Assume the distance between the sun and the mirror is infinity, and the sun is much above the principal axis. Where will the image of the sun be formed?
A. at $f$
B. at $R$
C. in the focal plane but below the principal axis
D. in the focal plane but above the principal axis
The correct answer is option C: in the focal plane but below the principal axis.
Given that the Sun is at infinity, the incoming sun rays on the mirror are parallel to the principal axis. By the properties of mirrors, parallel rays converge at the focal point. Since the sun's position is specified as "much above the principal axis," the parallel rays are directed downward, causing the image to form in the focal plane but below the principal axis.
What is meant by the 'angle of incidence' and the 'angle of refraction' for a ray of light?
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Sign up nowWhen a concave mirror is used as a shaving mirror, where is the person's face in relation to the focus of the mirror?
A. At focus
B. Between the centre of curvature and focus
C. Between pole and focus
D. Beyond the centre of curvature
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Sign up nowWhat happens when a ray of light gets refracted through a concave lens passing through F1?
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Sign up nowDefine red shift and blue shift in light.
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Sign up nowNo matter how far you stand from a mirror, your image appears erect. Which mirror are you most likely standing in front of?
A. Plane mirror
B. Concave mirror
C. Convex mirror
D. Either concave or convex mirror.
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Sign up nowWhich of the following statements is correct regarding the propagation of light of different colors of white light in air?
A) Red light moves fastest.
B) Violet light bends the most.
C) Both (1) and (2).
D) All the colors of white light move with the same speed.
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Sign up nowWhat type of reflection of light takes place from: (a) a rough surface? (b) a smooth surface?
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