Concave Mirrors and Light Quiz

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Questions and Answers

What happens when sunlight is converged by a concave mirror onto a paper sheet?

The paper begins to burn (correct)
The paper reflects the sunlight
The paper becomes wet
Nothing happens

The principal axis of a mirror is not normal to the mirror at its pole.

False (B)

What is the term used to describe the point where light rays converge after reflecting from a concave mirror?

principal focus

The distance of the image from the position of the mirror gives the approximate value of the __________ of the mirror.

focal length Signup and view all the answers

Match the following terms related to mirrors with their definitions:

Principal Axis = Normal to the mirror at its pole Focal Length = Distance from the mirror to the focus Concave Mirror = Mirror that converges light rays Convex Mirror = Mirror that diverges light rays Signup and view all the answers

What is the primary observation made when the paper is held close to a concave mirror directed towards the Sun?

A sharp, bright spot of light appears (B) Signup and view all the answers

Looking directly at the Sun is safe when using a concave mirror.

False (B) Signup and view all the answers

What occurs if the mirror and paper are held in position for several minutes during the activity described?

The paper may catch fire. Signup and view all the answers

What happens to the image formed by a concave mirror when the object is placed between the focus and the pole?

The image is virtual and upright (A) Signup and view all the answers

The principal focus of a concave mirror is located halfway between the pole and the center of curvature.

True (A) Signup and view all the answers

What is the nature of the image when the object is placed far beyond the center of curvature?

The image is real, inverted, and reduced in size. Signup and view all the answers

A concave mirror can form a ______ image depending on the position of the object.

virtual Signup and view all the answers

Match the positions of the object with the nature of the image formed:

Between P and F = Virtual Image At C = Real Inverted Image Beyond C = Real Reduced Image At F = No Image Formed Signup and view all the answers

What is required to observe the image clearly when using a concave mirror?

A bright object (A) Signup and view all the answers

The distance between any two successive lines drawn on the table should equal the ______ of the mirror.

focal length Signup and view all the answers

An image formed by a concave mirror can never be magnified.

False (B) Signup and view all the answers

What principle governs the behavior of incident and reflected rays at a mirror's surface?

Laws of reflection (B) Signup and view all the answers

The angle of reflection is equal to the angle of refraction at a mirror's surface.

False (B) Signup and view all the answers

Name one common use of a concave mirror.

Shaving mirrors or vehicle headlights. Signup and view all the answers

Concave mirrors are used to __________ sunlight to produce heat in solar furnaces.

concentrate Signup and view all the answers

When an object is placed in front of a convex mirror, the image formed is typically:

Erect and diminished (C) Signup and view all the answers

Match the following mirror types with their common uses:

Concave mirror = Solar furnace Convex mirror = Traffic monitoring Signup and view all the answers

What happens to the size of the image when the object is moved away from a convex mirror?

The size of the image remains diminished. Signup and view all the answers

A convex mirror always produces an inverted image.

False (B) Signup and view all the answers

What does the refractive index of a medium represent?

The ratio of the speed of light in two media (A) Signup and view all the answers

The absolute refractive index of a medium is defined with respect to another medium.

False (B) Signup and view all the answers

What is the refractive index of water?

1.33 Signup and view all the answers

The absolute refractive index of a medium is simply called its __________.

refractive index Signup and view all the answers

Match the following media with their refractive indices:

Water = 1.33 Crown Glass = 1.52 Air = 1.00 Diamond = 2.42 Signup and view all the answers

What is the main phenomenon that occurs when light travels from one medium to another at an angle?

Refraction (C) Signup and view all the answers

A person can easily pick up a coin placed at the bottom of a bucket filled with water from the side without any difficulties.

False (B) Signup and view all the answers

Why does the coin become visible again when water is poured into the bowl?

The refraction of light in water raises the apparent position of the coin, making it visible. Signup and view all the answers

The bending of light when it passes through a glass slab is known as __________.

refraction Signup and view all the answers

Match the following activities with their results:

Activity 10.7 = Difficulty in picking up the coin Activity 10.8 = Coin becomes visible again Activity 10.9 = Line appears bent under the slab Activity 10.10 = Outline of the glass slab is drawn Signup and view all the answers

In Activity 10.9, what did the observer notice when looking at the line under the glass slab at an angle?

The line appears bent (C) Signup and view all the answers

A glass slab placed normal to a line does not change the appearance of the line.

True (A) Signup and view all the answers

What is the purpose of drawing the outline of the glass slab in Activity 10.10?

To observe the effect of refraction and identify the position of the slab. Signup and view all the answers

What is the unit of power of a lens?

Dioptre (C) Signup and view all the answers

Mirrors and lenses can form virtual images only.

False (B) Signup and view all the answers

What is the formula used to relate object-distance (u), image-distance (v), and focal length (f) of a spherical mirror?

1/f = 1/v + 1/u Signup and view all the answers

The speed of light in vacuum is approximately ______ m s^-1.

3×10^8 Signup and view all the answers

Where is the needle placed if a convex lens forms a real and inverted image equal to the size of the object at 50 cm?

50 cm from the lens (A) Signup and view all the answers

What is the power of a concave lens with a focal length of 2 m?

-0.5 D Signup and view all the answers

When a light ray travels from a denser medium to a rarer medium, it bends ______ from the normal.

away Signup and view all the answers

Match the following concepts with their descriptions:

Real Image = Inverted and formed on the opposite side of the lens Virtual Image = Upright and formed on the same side as the object Magnification = Ratio of height of image to height of object Focal Length = Half of the radius of curvature for mirrors Signup and view all the answers

Flashcards

Principal Focus (Concave Mirror)

The point where parallel rays of light converge after reflecting off a concave mirror.

Focal Length (Concave Mirror)

The distance between the pole of a concave mirror and its principal focus.

Principal Axis (Mirror)

A line passing through the center of curvature and the pole of a mirror.

Reflection of parallel rays (Concave Mirror)

Rays of light parallel to the principal axis of a mirror are reflected through a point called the principal focus.