Reflections of Light

Class 10 Physics Chapter - Complete Test (English Medium)

Chapter Notes

Key Concepts

Reflection of Light: The bouncing back of light when it strikes a smooth surface.

Laws of Reflection:

1. The incident ray, reflected ray, and normal all lie in the same plane.
2. Angle of incidence (i) = Angle of reflection (r).

Types of Reflection:

• Regular Reflection: From smooth surfaces like mirrors.
• Diffuse Reflection: From rough surfaces like paper.

Plane Mirror:

• Forms virtual and erect image.
• Image size = Object size.
• Image is laterally inverted.
• Distance of image from mirror = Distance of object from mirror.

Spherical Mirrors:

• Concave Mirror: Converging mirror, reflecting surface curved inwards.
• Convex Mirror: Diverging mirror, reflecting surface curved outwards.

Important Terms:

• Pole (P): Center of the mirror.
• Center of Curvature (C): Center of the sphere of which mirror is a part.
• Focus (F): Point where parallel rays converge or appear to diverge.
• Focal Length (f): Distance between pole and focus.

Mirror Formula: 1/f = 1/v + 1/u
Where f = focal length, v = image distance, u = object distance

Magnification (m): m = h'/h = -v/u
Where h' = image height, h = object height

Uses of Mirrors:

• Concave: Shaving mirrors, searchlights, telescopes.
• Convex: Rear-view mirrors, security mirrors.

Test Questions

Multiple Choice Questions (15 Questions)

1

Which of the following best describes the reflection of light?

Absorption of light by surfaces

Bending of light when passing through different media

Bouncing back of light when it strikes a surface

Splitting of light into its constituent colors

2

According to the law of reflection, the angle of incidence is:

Greater than the angle of reflection

Less than the angle of reflection

Equal to the angle of reflection

Not related to the angle of reflection

3

Which type of mirror always forms a virtual, erect, and diminished image?

Plane mirror

Concave mirror

Convex mirror

Cylindrical mirror

4

The focal length of a spherical mirror is:

Half of its radius of curvature

Equal to its radius of curvature

Twice its radius of curvature

One-fourth of its radius of curvature

5

In a plane mirror, the image formed is:

Real and inverted

Real and erect

Virtual and inverted

Virtual and erect

6

Which mirror is used by dentists to see enlarged images of teeth?

Plane mirror

Convex mirror

Concave mirror

Both convex and concave

7

The mirror formula is given by:

1/f = 1/v - 1/u

1/f = 1/v + 1/u

f = v + u

f = v × u

8

Magnification produced by a plane mirror is:

Less than 1

Greater than 1

Equal to 1

Zero