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A spherical mirror and thin spherical lens - each have a focal length of -15 cm. It is likely that:
  • a)
    The mirror is convex, but the lens is concave.
  • b)
    The mirror is concave, but the lens is convex.
  • c)
    Both are concave
  • d)
    Both are convex
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A spherical mirror and thin spherical lens -each havea focal length of...
The spherical mirror and the spherical lens - both are concave. The distance of the principal focus measured from the pole is called the focal length. According to the New Cartesian Sign Convention, the focal length of a concave mirror as well as that of a concave lens is considered negative.
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A spherical mirror and thin spherical lens -each havea focal length of -15 cm.It islikely that:a)The mirror is convex, but the lens is concave.b)The mirror is concave, but the lens is convex.c)Both are concaved)Both are convexCorrect answer is option 'C'. Can you explain this answer?
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