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Science True-False

Light – Reflection and Refraction · Jharkhand Board (JAC) STD 10 (Jharkhand - English Medium). 9 questions.

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9 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
State whether the following statement is true or false:
A diverging mirror is used as a rear-view mirror.
Answer
True.
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Question 21 Mark
Both concave and convex mirror send the reflected light at the same angle as the angle of incidence on the other side of the principal axis. [True/ False]
Answer
True.
Explanation:
The normal line divides the angle between the incident ray and the reflected ray into two equal angles. The angle between the incident ray and the normal is known as the angle of incidence.
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Question 31 Mark
A convex mirror of focal length 'f' produces an image $\frac{1}{\text{m}}$ of the size of object, then object distance is (m - 1)f numerically. [True/ False]
Answer
True.
Explanation:
The focal length of a concave mirror, with a real focus, is always positive, and the focal length of a convex mirror, with a virtual focus, is always negative.
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Question 41 Mark
Magnification produced for an object at 2F by a convex lens is m = +1. [True/ False]
Answer
True.
Explanation:
The convex lens is a lens that converges rays of light that convey parallel to its principal axis.
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Question 51 Mark
One can identify the nature of a mirror from the nature of the image it forms. [True/ False]
Answer
True.
Explanation:
Both are concave mirror. formula of magnification is $\frac{\text{v}}{\text{u}}$
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Question 61 Mark
Convex mirror and convex lens always form virtual image. [True/ False]
Answer
True.
Explanation:
A convex mirror forms only virtual, diminished and erect images for all positions of the object, whereas a convex lens can form both real, inverted images of various sizes and virtual, erect and enlarged images depending on the position of the object.
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Question 71 Mark
State whether the following statement is true or false:
Refraction occurs because light slows down in denser materials.
Answer
True.
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Question 81 Mark
State whether the following statement is true or false:
A student says that we can see an object because light from our eyes is reflected back by the object
Answer
False.
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Question 91 Mark
Convex mirror and convex lens always form virtual image. [True/ False]
Answer
True.
Explanation:
A convex mirror forms only virtual, diminished and erect images for all positions of the object, whereas a convex lens can form both real, inverted images of various sizes and virtual, erect and enlarged images depending on the position of the object.
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True-False - Science STD 10 Questions - Vidyadip