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Harshini

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  1. Asked: November 24, 2020In: Class 7 Science

    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 a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be

    Harshini
    Added an answer on November 24, 2020 at 11:11 am

    (ii) 2 m/s Explanation: As the car moves 2 m backward, the mirror also moves 2 m backward, so image comes 2 m forward. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    (ii) 2 m/s
    Explanation:
    As the car moves 2 m backward, the mirror also moves 2 m backward, so image comes 2 m forward.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  2. Asked: November 24, 2020In: Class 7 Science

    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

    Harshini
    Added an answer on November 24, 2020 at 11:10 am

    (iii) 6 m Explanation: As David moves 1 m towards the mirror, the image also moves 1 m towards the mirror. Now the distance between David and mirror is 3 m and the distance between mirror and image is 3 m. So, the total distance between David and his image will be 6 m. https://www.tiwariacademy.com/Read more

    (iii) 6 m
    Explanation:
    As David moves 1 m towards the mirror, the image also moves 1 m towards the mirror. Now the distance between David and mirror is 3 m and the distance between mirror and image is 3 m. So, the total distance between David and his image will be 6 m.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  3. Asked: November 24, 2020In: Class 7 Science

    A virtual image larger than the object can be produced by a

    Harshini
    Added an answer on November 24, 2020 at 11:10 am

    (ii) concave mirror https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    (ii) concave mirror

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  4. Asked: November 24, 2020In: Class 7 Science

    Which type of lens forms always a virtual image?

    Harshini
    Added an answer on November 24, 2020 at 11:09 am

    Concave lens. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    Concave lens.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  5. Asked: November 24, 2020In: Class 7 Science

    Which type of mirror can form a real image?

    Harshini
    Added an answer on November 24, 2020 at 11:08 am

    Concave mirror. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    Concave mirror.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  6. Asked: November 24, 2020In: Class 7 Science

    Give one use each of a concave and a convex mirror.

    Harshini
    Added an answer on November 24, 2020 at 11:08 am

    • Concave mirror is used by dentist, solar furnace, reflector of a torch, etc. • Convex mirror is used in rear view mirrors. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    • Concave mirror is used by dentist, solar furnace, reflector of a torch, etc.
    • Convex mirror is used in rear view mirrors.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  7. Asked: November 24, 2020In: Class 7 Science

    State the characteristics of the image formed by a plane mirror.

    Harshini
    Added an answer on November 24, 2020 at 11:07 am

    Characteristics of the image formed by a plane mirror: • Virtual and erect. • Behind the mirror. • Size of image is equal to size of object. • Laterally inverted image (image of left side visible on right side). • Distance of image behind the mirror is equal to distance of object in front of mirror.Read more

    Characteristics of the image formed by a plane mirror:
    • Virtual and erect.
    • Behind the mirror.
    • Size of image is equal to size of object.
    • Laterally inverted image (image of left side visible on right side).
    • Distance of image behind the mirror is equal to distance of object in front of mirror.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  8. Asked: November 24, 2020In: Class 7 Science

    State two differences between a convex and a concave lens.

    Harshini
    Added an answer on November 24, 2020 at 11:06 am

    • A convex lens can make images which are enlarged or smaller or equal to the size of the object whereas concave lens can always make smaller image. • A convex lens makes both real image and virtual images whereas a concave lens always makes a virtual image. https://www.tiwariacademy.com/ncert-solutRead more

    • A convex lens can make images which are enlarged or smaller or equal to the size of the object whereas concave lens can always make smaller image.
    • A convex lens makes both real image and virtual images whereas a concave lens always makes a virtual image.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  9. Asked: November 24, 2020In: Class 7 Science

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

    Harshini
    Added an answer on November 24, 2020 at 11:05 am

    The image, which cannot be obtained on a screen, is called virtual image. The images formed by plane mirror, convex mirror and concave lens are virtual. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    The image, which cannot be obtained on a screen, is called virtual image. The images formed by plane mirror, convex mirror and concave lens are virtual.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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  10. Asked: November 24, 2020In: Class 7 Science

    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.

    Harshini
    Added an answer on November 24, 2020 at 11:04 am

    A, H, I, M, O, T, U, V, W and X are the letters which form same image as the letter is. These letters are laterally symmetrical. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

    A, H, I, M, O, T, U, V, W and X are the letters which form same image as the letter is. These letters are laterally symmetrical.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-15/

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