Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 27

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Question 1
1 / -0

A beam of light incident on a thin concave lens parallel to its principal axis diverges and appears to come from a point on the principal axis. Name the point :

A
First focus

B
Second focus

C
First centre

D
Second centre

Solution

A beam of light parallel to the principal axis upon passing through the concave lens diverges. The divergent rays produced backwards appear to come from the second principal focus of the lens.
Question 2
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Name the mirrors shown in figure $(a)$ and $(b)$ :

A
(a) and (b) both are convex mirrors

B
(a) and (b) both are concave mirrors

C
(a) is convex mirror and (b) is concave mirror

D
(a) is concave mirror and (b) is convex mirror

Solution

Concave and convex mirrors are defined on the basis of polished surface or reflecting surface.
a) Reflecting surface of the mirror is bulging out (convex) so it is a convex mirror.
b) Reflecting surface of the mirror is cave-like (concave) so it is a concave mirror.
Question 3
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The phenomenon of light coming back after hitting a smooth plane surface is called :

A
Reflection

B
Refraction

C
Dispersion

D
Total internal reflection

Solution

Reflection is the phenomenon of light coming back after hitting a smooth plane surface.
Option A
Question 4
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The phenomenon of light passing through the object is called :

A
Reflection

B
Refraction

C
Dispersion

D
Total internal reflection

Solution

The phenomena when light passes through the object (a medium) is known as refraction. Refraction is defined as the bending of light ray when it passes from one medium to another.
Question 5
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The distance between the focus and the pole of the mirror is called :

A
Focal length

B
Radius of curvature

C
Principal axis

D
Diameter of curvature

Solution

The distance between the focus and the pole of the mirror is called focal length.
Question 6
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State the condition when a lens is called an equi-convex or equi-concave.

A
When radii of curvature of the two surfaces of lens are equal.

B
When height of the two lens are equal.

C
When radii of curvature of the two surfaces of lens unequal.

D
None of the above

Solution

A lens is made up of two curved surfaces which can be concave or convex surfaces. When both the surfaces are of the same kind and have the same focal length, they form an equi-convex or equi-concave lens. For such lenses, the first and second principal focus will be at the same distance from the optical centre.
Question 7
1 / -0

Fill in the blanks:
The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.

A
speed

B
direction

C
both A & B

D
None of the above

Solution

The phenomenon of change in the path of light when it passes from one transparent medium to another is refraction. This change in path is due to the change in the speed of light in different media.
Question 8
1 / -0

A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. What special name is given to this point on the principal axis?

A
Optical centre

B
Second centre

C
First focus

D
Second focus

Solution

Optical centre is the point through which any ray passes undeviated. It the the center of the lens.
Question 9
1 / -0

A ray of light, after refraction through a convex lens emerges parallel to the principal axis. The incident ray when produced appear to come from a point on principal axis. Name the point :

A
first focus

B
first centre

C
last focus

D
last centre

Solution

Principal or first focus is the point from which incident rays after passing through convex lens, become parallel to the principal axis.
Question 10
1 / -0

The light ray which strikes any polished surface at some angle is called:

A
reflected ray

B
incident ray

C
normal ray

D
none of these

Solution

The ray of light which falls on a polished smooth surface at some angle other than 90 degree is called incident ray of light.