Reflection of Light

Some facts about Light

light

Optics is a branch of Science which is the study of Light

Question 1

Light is a form of Energy

Question 2

Light itself invisible, but it makes objects visible

Question 3

Light has different speeds and wavelengths in different mediums but has same frequency

Question 4

In visible spectrum (VIBGYOR), Red has greater frequency

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Light falling on the surface of an object comes back to the same medium. This is reflection of light.

reflection

The incident ray, reflected ray and normal to the surface are in the plane.

When light is reflected from a smooth surface, the angle of incidence and angle of reflection are

When light falls on a rough surface, it undergoes an irregular reflection. This is reflection

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Image Formation by a Plane Mirror

Question

plane

It is the image formation by a plane mirror. Select the correct options

Answers

The image is real

The image is erect

Size of the image and that of object are same

Image distance and object distance from the mirror are same

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Multiple Reflection and Image Formation

If θ is the angle between two plane mirrors which are kept in contact at their edges, the number of images formed is given by the following equation

no

Select the correct options

Angle Number of Images
30
45
60
90
120
180

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Convex mirror

convex

Complete the following sentence with Convex mirror

Image is formed in between the of the mirror and the principal .

The image is diminished, and erect .

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Image formation of Concave Mirror

convex

Read and complete

Position of the Object Features of the Image
At infinity Image is real and formed at the
Beyond C

Image size is , real and inverted, and formed in between

focus and centre of curvature
At C Image size is same, formed at and it is real and inverted
Between C and F Image size is magnified, real and , and formed beyond centre of curvature
At F Image is not formed or Image is formed at
Between F and P Image is magnified, erect and

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Find the type of the Mirror

Question

Mirror which forms erect and enlarged image when object is placed between principal focus and pole.

Mirror which converges distant rays to the principal focus.

Mirror which reflects the rays coming from principal focus as parallel rays.

Answers

Concave Mirror

Convex Mirror

Plane Mirror

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Question

The field of view is maximum for a --------------  mirror. That is why these mirrors are used as rear view mirrors

Answers

Concave Mirror

Convex Mirror

Plane Mirror

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New Cartesian Sign Convention

The incident ray is to be considered as traveling from left to right.

  • Distances are measured considering the of the mirror as the origin (O).
  • Those measured to the right from O are and those in the opposite direction are .
  • Distances measured upwards from X axis are and those downwards are .

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Law of distances

distances

Refer this equation and Cartesian Sign Convention, then select the correct option

u = -30 cm and v = - 20 cm then it is a Mirror.

Mirror always gives erect ans diminished image.

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DropDown Activity

magnification

Refer this equation and Cartesian Sign Convention, then select the correct option

Mirror u and v m Image Features
Concave
 u > v

- ve

m < 1

Real ,

and diminished
Concave
 u = v

- ve

m = 1

Real ,

inverted

and

Concave
 u < f

+ ve

m > 1

Virtual,

and magnified

Convex
 v < u

+ ve

m < 1

,

erect

and diminished

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