Light and Optics Worksheet with Answer Key
Q1. Answer briefly:
1. When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand. Name the phenomenon responsible for this.
Lateral Inversion
2. Name the mirror used as a shaving mirror.
Concave mirror
3. If the image formed by a lens is always virtual, erect, and smaller than the object, what is the nature of the lens?
Concave lens
4. What acts as tiny prisms in the formation of a rainbow?
Raindrops
5. For which position of the object does a concave mirror produce a virtual, erect, and magnified image?
Between the focus and pole
6. Write the word LEFT as you would see it in a plane mirror.
DIY (Mirror Image)
7. What type of image is formed:
– In a plane mirror? Virtual, erect
– On a cinema screen? Real and inverted
– On a cinema screen? Real and inverted
8. A concave lens diverges parallel rays of light, whereas a convex lens converges parallel rays of light.
9. Which mirror always forms a virtual and erect image that is smaller than the object?
Convex mirror
10. Which type of mirrors are used by doctors for examining the eyes, ears, nose, and throat?
Concave mirrors (Magnifying lens effect)
11. What is the other name of:
(i) A diverging lens? Concave lens
(ii) A converging lens? Convex lens
(ii) A converging lens? Convex lens
Q2. Rewrite the incorrect statements:
1. Incorrect Statement: A plane mirror can magnify the image of an object.
Correct Statement: A plane mirror always forms an image of the same size as the object.
2. Incorrect Statement: A convex mirror focuses parallel rays of light to a single point.
Correct Statement: A concave mirror focuses parallel rays of light to a single point.
Q3. Give reasons:
1. The image formed by a plane mirror appears to be the same distance behind the mirror as the object is in front of it.
Reason: This happens due to the laws of reflection. The light rays appear to originate from behind the mirror, maintaining the same distance as the object, thus creating a virtual image.