NCERT Solutions for Class 7 Science Chapter 15 Light

NCERT Solutions for Class 7 Science Chapter 15

NCERT Solutions for Class 7 Science Chapter 15: This page consist of details solution of chapter  Light class 7 science. You can check NCERT Solutions for class 7 Science for other chapters of class 7 science prepared by Physics Wallah. do the questions by yourself and check your solution with Physics Wallah NCERT solution for the chapter Light. to have more depth in chapter  Light class 7 science you must read the theory of Light and do the additional question of Physics Wallah click this link to do the questions and read theory of Light. along with NCERT solution of class 7 science.

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NCERT Solutions for Class 7 Science Chapter 15 Light Overview

NCERT Solutions for Class 7 Science Chapter 15 Light

While solving science specifically for class 7 you need lots of resource to excel in class 7 science to give you edge Physics Wallah uploaded additional questions of class 7 science for solid foundation of class 7 science, Academic team of Physics Wallah uploaded detail theory of class 7 science with added additional Notes & Questions.

NCERT Solutions for Class 7 Science Chapter 15 Exercise 1

Question 1:Fill in the blanks:

(a) An image that cannot be obtained on a screen is called ________.

(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.

Question 2: 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 forms 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)

Question 3: Match the items given in Column I with one or more items of Column II.

Answer: (a) (v) A plane mirror forms an image which is erect and of the same size as the object.

(b) (ii) and (vi)

(c) (i)

(d) (iii)

(e) (vi)

Question 4: State the characteristics of the image formed by a plane mirror. Answer: The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the object. The left side of the object appears on the right side of the image. Also, the distance of the image from the plane mirror is same as the distance between the plane mirror and the object.

Question 5: Find out the letters of 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. Answer: If the letters of English alphabet A, H, I, M, O, T, U, V, W, X, Y are kept in front of a plane mirror, then they would form images which exactly look like the original letters of the alphabet. These letters are vertically symmetric. For example, if we divide letters A and U in the middle, then we would find that the right halves are equivalent to the left halves of the letters.

Hence, even if the image interchanges sidewise, it will appear same as the letter.

Question 6: What is a virtual image? Give one situation where a virtual image is formed.

Answer: When an image cannot be obtained on a screen, it is called a virtual image. The image formed by a plane mirror is virtual, because the image cannot be obtained on a screen when placed either in front of the mirror or behind it.

Question 7: State two differences between a convex and a concave lens.

Answer: (i) Convex lens is thicker in the middle while concave lens is thinner in the middle.

(ii) A convex lens converges the light ray falling on it, while a concave lens diverges the light ray falling on it.

Question 8: Give one use each of a concave and a convex mirror.

Answer: Concave mirrors can form enlarged image of the object. Therefore, they are used by the dentist to see the enlarged image of the patient’s teeth. Convex mirror forms diminished and upright image of the object. It is used as a side view mirror of the car because it enables the driver to view objects spread over a large area behind him/her.

Question 9: Which type of mirror can form a real image?

Answer: A concave mirror can form real image of an object. The nature of the image depends on the distance of the object from the concave mirror.

Question 10: Which type of lens forms always a virtual image?

Answer: A concave lens always forms a virtual image of an object.

Question 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

Answer: (ii) Concave mirror can form virtual and magnified image of the object.

Question 12: 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

Answer: (iii) 6 m

Given, Distance between the mirror and David’s image, d2 = 4 m Therefore, d1 = d2 = 4 m If David moves 1 m towards the mirror, then d1 = 4 − 1 = 3 m Again, d1 = d2 = 3 m Therefore, the distance between David and his image is d1 + d2 = 3 + 3 = 6 m.

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Question 13:The rear view 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 rear view mirror the image of 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

Answer: (iii) 4 m/s