You have a convex lens of focal length 10 cm. At what distance from the lens, should you hold an object to get image of the same size as the object?
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You have a convex lens of focal length 10 cm. At what distance from the lens, should you hold an object to get image of the same size as the object?
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Answer:
Object distance = 5 cm
Explanation:
focal length = f = 10 cm
object size = image size
p = q
Lens formula is given as
1/f = 1/p + 1/q
1/10 = 1/p + 1/p
1/10 = 2/p
1/5 = 1/p
p = 5 cm
So, if the object is placed 5 cm at left side of the lens. An image of same side will be formed as of object size.
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