True-False [Phy-1M]

Question 11 Mark

State whether the following statement is true or false:
Refraction occurs because light slows down in denser materials.

Answer

True.

Question 21 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 31 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 41 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 51 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 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

Convex mirror and convex lens always form virtual image. [True/ False]

Answer

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Question 81 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 91 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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Science True-False [Phy-1M]

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