What will be the nature of the image formed from both a convex lens and a concave lens of 20 centimeter focus distance, when the object

Question

What will be the nature of the image formed from both a convex lens and a concave
lens of 20 centimeter focus distance, when the object is placed at a distance of
10 centimeters?​

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Adela 6 months 2021-08-09T14:38:23+00:00 1 Answers 7 views 0

Answers ( )

    0
    2021-08-09T14:39:46+00:00

    Answer:

    Explanation:

    Using the lens formula

    1//f = 1/u+1/v

    f is the focal length of the lens

    u is the object distance

    v is the image distance

    For convex lens

    The focal length of a convex lens is positive and the image distance can either be negative or positive.

    Given f = 20cm and u = 10cm

    1/v = 1/f – 1/u

    1/v = 1/20-1/10

    1/v = (1-2)/20

    1/V = -1/20

    v = -20/1

    v = -20 cm

    Since the image distance is negative, this shows that the nature of the image formed by the convex lens is a virtual image

    For concave lens

    The focal length of a concave lens is negative and the image distance is negative.

    Given f = -20cm and u = 10cm

    1/v = 1/f – 1/u

    1/v = -1/20-1/10

    1/v = (-1-2)/20

    1/V = -3/20

    v = -20/3

    v = -6.67 cm

    Since the image distance is negative, this shows that the nature of the image formed by the concave lens is a virtual image

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )