Please select a subject first
Advertisements
Advertisements
Say TRUE or FALSE
The image formed in a plane mirror is upside down
Concept: undefined >> undefined
Say TRUE or FALSE
A plane mirror is opaque
Concept: undefined >> undefined
Advertisements
Figure shows a pencil placed above a mirror
- Draw its image formed by the mirror
- Show how light rays from the object are reflected at the mirror to form the image for the eye.
Concept: undefined >> undefined
A person is looking at the image of a tree in a mirror placed 3.5 m in front of him. Given that the tree is at 0.5 m behind his eyes. Find the distance between the image of the tree and his eyes. What are needed to see an object?
Concept: undefined >> undefined
A boy of height 1m 45 cm is standing in front of a long mirror at a distance of 2 m. From this information, fill up the following sentences:
- The distance between the boy and his image is ______
- The height of the image is______
- When the boy moves 1m forward, the distance between her and her image is______
Concept: undefined >> undefined
Draw a diagram of a pin hole camera showing the rays of light passing between the Object and its image
Concept: undefined >> undefined
What are the characteristics of an image formed in a plane mirror?
Concept: undefined >> undefined
True or False
Degradable plastics break down into tiny pieces called microplastics.
Concept: undefined >> undefined
Assertion and Reason
A: It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose.
R: Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable.
Concept: undefined >> undefined
What does the term biodegradable mean?
Concept: undefined >> undefined
Suggest safe methods of disposing plastics.
Concept: undefined >> undefined
Thomas Alva Edison invented more than ______ useful inventions which are used in homes.
Concept: undefined >> undefined
The image which can be obtained on a screen is called ______.
Concept: undefined >> undefined
The images that are obtained on a screen are called ______ and that which cannot be obtained on a screen ______.
Concept: undefined >> undefined
Match the following:
| 1. | Real image | a. | Diffuse reflection |
| 2. | Virtual image | b. | An optical device which produces reflection |
| 3. | Mirror | c. | Cannot be taken on screen |
| 4. | A type of light scattering | d. | Can be taken on screen |
Concept: undefined >> undefined
Assertion (A): Virtual objects can’t be seen by the human eye.
Reason (R): Virtual image is formed by converging rays.
Concept: undefined >> undefined
Write the difference between real images and virtual images.
Concept: undefined >> undefined
Calculate the number of images formed by plane mirrors kept at an angle of 10° to each other.
Concept: undefined >> undefined
Which of these is not a property of plastics?
Concept: undefined >> undefined
