English Medium कक्षा १० - CBSE Question Bank Solutions for Science

What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?

A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light? 

 Which type of reflection of light leads to the formation of images?

What is the difference between regular reflection of light and diffuse reflection of light? 

What type of reflection of light takes place from a cinema screen?

 A boy with a mouth 5 cm wide stands 2 m away from a plane mirror. Where is his image and how wide is the image of his mouth?

The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?

 An extended object in the form of an arrow pointing upward has been placed in front of a plane mirror. Draw a labelled ray-diagram to show the formation of its image.

 State the uses of plane mirrors.

What is meant by 'reflection of light'?

Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram: 

(a) Incident ray
(b) Point of incidence
(c) Normal
(d) Reflected ray
(e) Angle of incidence
(f) Angle of reflection

State and explain the laws of reflection of light at a plane surface (like a plane mirror), With the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is 47.5°, what will be the angle of incidence?

With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.

 Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper.

 The image in a plane mirror is virtual and laterally inverted. What does this statement mean?

 Write all the capital letters of the alphabet which look the same in a plane mirror.

The angle of reflection is equal to the angle of incidence:

(a) always
(b) sometimes
(c) under special conditions
(d) never

The image of an object formed by a plane mirror is:

(a) virtual
(b) real
(c) diminished
(d) upside-down

The image formed by a plane mirror is :

(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real, at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.

The figure given alongside shows the image of a clock as seen a plane mirror. The correct time is:
Figure

(a) 2.25
(b) 2.35
(c) 6.45
(d) 9.25