2.
A convex lens forms a real and inverted image of a needle at a distance
of 50 cm from it. Where is the needle placed in front of the convex lens
if the image is equal to the size of the object? Also, find the power of the
lens.
Answers
Answer:
the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
Explanation:
the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
Object distance, u= – 50 cm
Image distance, v= 50 cm
Focal length = f
According to the lens formula,
u = -50 cm v = + 50 cm. f =? 1/f = 1/v €“ 1/u 1/f = 1/50 + 1/50 f = + 25 cm. = 0.25 m Power of lens (P) = 1/f = 1/ 0.25 = + 4D.