Light : Reflection And Refraction
Questions and Answers
- 1.
A converging mirror is used i which of the following:-
- A.
Solar furnaces
- B.
Rear view mirror
- C.
Street light reflector
Correct Answer
A. Solar furnacesExplanation
A converging mirror is used in solar furnaces because it is designed to focus sunlight onto a small area, creating intense heat. This concentrated heat can be used for various purposes such as generating electricity or melting metals. The mirror's shape allows it to converge the incoming parallel rays of sunlight to a single focal point, maximizing the concentration of energy.Rate this question:
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- 2.
Mirror used by dentist to get larger view of teeth is a concave mirror.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A concave mirror is used by dentists to get a larger view of teeth because it converges the light rays and forms a magnified image. This allows the dentist to see the teeth more clearly and examine them in detail.Rate this question:
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- 3.
Which of the following in use in magnifying glass:-
- A.
Concave mirror
- B.
Concave lens
- C.
Convex mirror
- D.
Convex lens
Correct Answer
D. Convex lensExplanation
A convex lens is used in a magnifying glass because it is thicker in the middle and thinner at the edges. This shape causes light rays to converge, or come together, which creates a magnified image. The convex lens bends the light rays inward, allowing the object being viewed to appear larger and clearer.Rate this question:
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- 4.
What can we say about the medium in which light bends towards the normal while travelling from one medium to another?
- A.
We can say that, first is a denser medium and second is a rarer medium
- B.
We can say that, first is a rarer medium and second is a denser medium
- C.
We can say that, both are rarer medium
- D.
We can say that, both are denser medium
Correct Answer
B. We can say that, first is a rarer medium and second is a denser mediumExplanation
When light travels from one medium to another and bends towards the normal, it indicates that the first medium is less optically dense (rarer) compared to the second medium, which is more optically dense (denser). The bending of light towards the normal occurs due to the change in the speed of light as it passes from one medium to another.Rate this question:
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- 5.
Which mirror can produce a virtual, erect and magnified image of an object?
- A.
Concave mirror
- B.
Convex mirror
- C.
Plane mirror
- D.
Both concave and convex mirrors
Correct Answer
A. Concave mirrorExplanation
A concave mirror can produce a virtual, erect, and magnified image of an object. This is because a concave mirror is curved inward, causing light rays to converge at a focal point. When an object is placed beyond the focal point, a magnified and upright virtual image is formed.Rate this question:
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- 6.
The angle of incidence for a ray of light having zero reflection angle is
- A.
0
- B.
30°
- C.
45°
- D.
90°
Correct Answer
A. 0Explanation
When the reflection angle is zero, it means that the ray of light is incident perpendicular to the surface. In this case, the angle of incidence is also zero because it is the angle between the incident ray and the normal to the surface. So, when there is no reflection angle, the angle of incidence is 0 degrees.Rate this question:
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- 7.
If an incident ray passes through the focus, the reflected ray will
- A.
Pass through the pole
- B.
Be parallel to the principal axis
- C.
Retrace its path
- D.
Pass through the centre of curvature
Correct Answer
B. Be parallel to the principal axisExplanation
When an incident ray passes through the focus of a concave mirror, it will be reflected parallel to the principal axis. This is because the focus is a special point on the principal axis where all incident rays that are parallel to the principal axis converge after reflection. Therefore, when an incident ray passes through the focus, it will be reflected back along the same path as if it were parallel to the principal axis.Rate this question:
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- 8.
Magnifying power of a concave lens is
- A.
Always > 1
- B.
Always < 1
- C.
Always = 1
- D.
Can have any value
Correct Answer
B. Always < 1Explanation
A concave lens is a diverging lens, meaning it disperses light rays. When light rays pass through a concave lens, they diverge and do not converge to a point. This causes the image formed by the lens to be smaller and farther away than the object. The magnifying power of a lens is determined by the ratio of the image distance to the object distance. Since the image formed by a concave lens is smaller than the object, the magnifying power is always less than 1.Rate this question:
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- 9.
If the magnification produced by a lens has a negative value, the image will be
- A.
Virtual and inverted
- B.
real and erect
- C.
Real and inverted
- D.
Virtual and erect
Correct Answer
D. Virtual and erectExplanation
If the magnification produced by a lens has a negative value, it means that the image formed by the lens will be virtual and erect. A negative magnification indicates that the image is formed on the same side as the object, and it will be upright (erect) compared to the object. Additionally, a virtual image is formed when the light rays do not actually converge at the image position, but they appear to diverge from a virtual position.Rate this question:
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- 10.
When the object is placed between f and 2f of a convex lens, the image formed is
- A.
at f
- B.
At 2f
- C.
Beyond 2f
- D.
Between O and f
Correct Answer
C. Beyond 2fExplanation
When an object is placed between the focal point (f) and twice the focal length (2f) of a convex lens, the image formed is located beyond 2f. This is because in this position, the image is virtual, upright, and magnified. The lens converges the light rays from the object and forms an image on the opposite side of the lens. Since the object is placed closer to the lens than the focal point, the image is formed on the same side as the object but beyond 2f.Rate this question:
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Current Version
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Jul 01, 2023Quiz Edited by
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Jul 01, 2020Quiz Created by
Priyanka Gupta
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