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A student focused the image of a candle ...

A student focused the image of a candle flame on a white screen by placing the flame at various distance from a convex lens. He noted his observation as mentioned in the following table.

Analyze the above table and answer the following questions.
What is the focal length of the convex lens?

Text Solution

Verified by Experts

When object is at distance 2f, image is fonned at distance 2f on the other side. In this case, when u = 30 cm, v = 30 cni This implies, 2f = 30 cm
`therefore` The focal length of the convex lens is 15 cm
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A student focused the image of a candle flame on a white screen by placing the flame at various distance from a convex lens. He noted his observation as mentioned in the following table. Analyze the above table and answer the following questions. If teacher asked the student to place the flame of candle at distance 20 cm from convex lens then, at what distance will the image be observed by the student?

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Knowledge Check

  • A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as : What type of lens is a convex lens?

    A
    Diverging lens
    B
    Converging lens
    C
    Flat lens
    D
    Non-converging lens

  • A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as : Which set of observations is incorrect?

    A
    u = 60 cm, v = 20 cm
    B
    u = 15 cm, v = 70 cm
    C
    u = 30 cm, v= 30 cm
    D
    u = 24 cm, v = 40 cm

  • A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as: Which set of observations is incorrect?

    A
    a)
    B
    c)
    C
    e)
    D
    d)

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    A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as: Which of the following statement is false for the formation of images by convex lens?

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