NCERT Solutions for Class 7 Science Chapter 15 Light Exercise Questions
NCERT Solutions for Class 7 Science Chapter 15, "Light," are available right here. This chapter covers topics related to light and the reflection of light, offering students a comprehensive understanding of these concepts. To excel in Class 7 Science exams, it is highly recommended that students utilize NCERT Solutions for Class 7 Science. By working through the NCERT questions found at the end of each chapter, students can acquire a detailed and in-depth grasp of the subject matter. Here are some important topics covered in this chapter:
Light
Which type of mirror can form a real image?
The concave mirror can form a real image.
Fill in the blanks.
(a) An image that cannot be obtained on a screen is called a ____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.
(a) An image that cannot be obtained on a screen is called a virtual image.
(b) Image formed by a convex mirror is always virtual and smaller in size.
(c) An image formed by a plane mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a real image.
(e) An image formed by a concave lens cannot be obtained on a screen.
Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always forms a real image. (T/F)
a) False
b) True
c) True
d) False
e) False
Match the items given in Column I with one or more items in Column II.
|
Column-I |
Column-II |
|
(a) A plane mirror |
(i) Used as a magnifying glass. |
|
(b) A convex mirror |
(ii) Can form images of objects spread over a large area. |
|
(c) A convex lens |
(iii) Used by dentists to see an enlarged image of teeth. |
|
(d) A concave mirror |
(iv) The image is always inverted and magnified. |
|
(e) A concave lens |
(v) The image is erect and of the same size as the object. |
|
(vi) The image is erect and smaller in size than the object. |
|
Column-I |
Column-II |
|
(a) A plane mirror |
(v) The image is erect and of the same size as the object. |
|
(b) A convex mirror |
(ii) Can form an image of objects spread over a large area. |
|
(c) A convex lens |
(i) Used as a magnifying glass. |
|
(d) A concave mirror |
(iii) Used by dentists to see an enlarged image of teeth. |
|
(e) A concave lens |
(vi) The image is erect and smaller in size than the object. |
State the characteristics of the image formed by a plane mirror.
Characteristics of the image formed by a plane mirror are as follows:
-
Image distance and object distance are equal.
-
The size of the object and image are equal.
-
The image formed is erect and virtual.
-
Images are laterally inverted.
Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
A, H, I, M, O, T, U, V, W, X, and Y alphabets form images in a plane mirror exactly like the letter itself because these alphabets are laterally symmetric.
What is a virtual image? Give one situation where a virtual image is formed.
The image that cannot be obtained on a screen is called a virtual image. The image formed by a plane mirror is virtual.
State two differences between a convex and a concave lens.
|
Convex Lens |
Concave Lens |
|
Thick in the middle and thin at the edge. |
Thin in the middle and thick at the edge. |
|
The image formed is real or virtual. |
The image formed is virtual. |
Give one use each of a concave and a convex mirror.
Concave mirrors are used in the headlights of cars and scooters.
Convex mirrors are used as side-view mirrors in vehicles.
11. A virtual image larger than the object can be produced by a
(i) concave lens
(ii) concave mirror
(iii) convex mirror
(iv) plane mirror
(ii) concave mirror.
David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
(i) 3 m (ii) 5 m
(iii) 6 m (iv) 8 m
(iii) 6 m
The rearview mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rearview mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
(i) 1 m/s (ii) 2 m/s
(iii) 4 m/s (iv) 8 m/s
(iii) 4 m/s.
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